Does ashwagandha make you sleepy

What the published research actually shows about ashwagandha and sleep

Ashwagandha is one of the few herbal supplements with reasonable clinical evidence for improving sleep. Five randomised controlled trials totalling 400 participants have been meta-analysed in PLOS One in 2021 (PMC8462692). The pattern across the trials is consistent. Ashwagandha improves multiple sleep parameters significantly. It also produces little acute drowsiness. Here is what the research actually shows.

1. Sleep onset latency reduces significantly

The Langade 2019 trial in Cureus (PMID 31728244) randomised 60 adults with insomnia to 300 mg ashwagandha twice daily or placebo for 10 weeks. Sleep onset latency reduced from 33.94 minutes to 29.00 minutes with ashwagandha (p less than 0.019) versus minimal change with placebo. The 2021 meta-analysis (5 RCTs, 400 participants) confirmed the effect at moderate quality of evidence. This means people fall asleep faster with sustained dosing not on the first night.

2. Total sleep time and sleep efficiency improve

The same meta-analysis found moderate-quality evidence for increased total sleep time (SMD -0.45, 95 percent CI -0.69 to -0.21) and improved sleep efficiency (SMD -0.68, 95 percent CI -1.07 to -0.29) versus placebo at doses of 600 mg or more for 8 weeks or more. Sleep efficiency means the proportion of time in bed actually spent sleeping. Higher efficiency feels like waking less during the night and feeling more rested in the morning.

3. The mechanism is cortisol normalisation not sedation

Ashwagandha does not bind to GABA-A receptors the way benzodiazepines and z-drugs do. It does not bind to melatonin receptors. It does not have antihistamine activity. What it does is lower cortisol particularly evening and night-time cortisol which is the cortisol pattern that disrupts sleep onset and depth. Reducing evening cortisol allows normal melatonin signalling to engage and normal sleep to occur. This is a slower, more physiological mechanism than sleeping pills.

4. Daytime drowsiness is uncommon

The Langade 2019 trial reported no daytime drowsiness as a side effect. The Salve 2019 trial reported reduced perceived stress without sedation. The NIH Office of Dietary Supplements does list drowsiness as a possible side effect but classifies it as mild and uncommon. A small minority of users report mild daytime relaxation or drowsiness particularly at higher doses or with split dosing. For most people the effect is more accurately described as feeling calmer rather than sleepy.

5. The effect builds over weeks, not the first night

Anyone expecting ashwagandha to act like a sleeping pill on the night they start taking it will be disappointed. The trials measure significant effects at 4 to 10 weeks of daily dosing. Cortisol normalisation across the diurnal curve takes weeks to occur. People who quit at day 3 because nothing happened on the first night have not given the supplement a chance to work. Give it 8 weeks before judging.

How to actually use ashwagandha for sleep in five steps

If you want to use ashwagandha for sleep, here is the protocol that matches the trials with positive results. Off-protocol use is unlikely to replicate the documented sleep improvements.

Step 1. Take it 1 to 2 hours before bed

Withanolides reach peak blood concentration around 1 to 2 hours after dosing. Taking your dose 1 to 2 hours before your target sleep time aligns peak levels with sleep onset. Most positive sleep trials used evening dosing. Taking it immediately before bed is also acceptable but reduces the bioavailability window. Pair the dose with a light snack containing some fat for better absorption.

Step 2. Use the clinically tested dose

Take 300 to 600 mg of standardised root extract for sleep. The Langade 2019 trial used 300 mg twice daily totalling 600 mg. The Deshpande 2020 trial used 600 mg once daily. Either protocol is supported by evidence. Look for KSM-66 or Shoden branded extracts standardised to at least 2.5 percent withanolides. Single evening dose is more convenient and the evidence supports it.

Step 3. Maintain consistent sleep schedule

Ashwagandha works through circadian cortisol regulation. Erratic bedtimes confuse the circadian rhythm and reduce the effect of any sleep intervention including the supplement. Pick a target bedtime and a target wake time and stick within 30 minutes of both 7 days a week. The supplement amplifies a consistent schedule rather than compensating for inconsistency.

Step 4. Remove the obvious sleep disruptors

Caffeine within 6 hours of bed disrupts sleep architecture even when you fall asleep fine. Alcohol within 3 hours of bed fragments sleep particularly in the second half of the night. Bright light from screens in the final 60 minutes suppresses melatonin. Ashwagandha cannot compensate for active sleep sabotage. Remove these before blaming the supplement for not working.

Step 5. Run the protocol for at least 8 weeks

Both the Langade and Deshpande trials measured significant effects at 8 to 10 weeks of daily dosing. Smaller effects emerged earlier at 4 to 6 weeks. Quitting before 8 weeks of consistent daily use is quitting before the supplement has had a fair chance. Track sleep onset latency, number of night-time awakenings and morning energy weekly. If nothing has shifted at 8 weeks despite addressing schedule and disruptors, see your GP about underlying causes of insomnia.

For anyone who wants better sleep without the side effects of sedative sleeping pills, our Ashwagandha Gummies deliver the same standardised root extract dose used in the clinical sleep trials. Same active ingredient. Same evening protocol. Much easier to take every night for the 8 to 10 weeks the research requires.

When ashwagandha is a problem

Ashwagandha at standard doses is well tolerated and not sedating in the way prescription sleeping pills are. The UK Food Standards Agency is currently reviewing ashwagandha food supplements. Stop the supplement and see your GP if any of the following apply.

• Excessive daytime drowsiness that affects driving, operating machinery or working safely. This is uncommon but possible particularly at higher doses. Reduce the dose or stop the supplement.
• Yellowing of the skin or eyes, dark urine or persistent right-sided abdominal pain. These can signal liver injury which has been reported rarely with ashwagandha use (LiverTox 2024).
• Sedatives, opioids or alcohol at the same time. Ashwagandha may enhance the effect of central nervous system depressants. Combination use should be discussed with your GP.
• Persistent insomnia for more than 4 weeks despite the supplement and sleep hygiene changes. Chronic insomnia needs medical assessment. The NHS recommends cognitive behavioural therapy for insomnia as first-line treatment.
• Symptoms of underlying conditions such as sleep apnoea (loud snoring, witnessed pauses, daytime fatigue), restless legs or significant low mood. These need diagnosis and treatment in their own right.

Anyone taking prescription sleeping pills, sedating antidepressants, sedating antihistamines or other CNS depressants should consult their GP before starting daily ashwagandha. People with severe persistent insomnia should not rely on supplements as primary treatment. The NHS provides Sleepio as a free digital CBT-I programme for adults with insomnia in many regions.

More on ashwagandha and sleep

The sleep effect connects to several other guides. Our piece on the link between ashwagandha and better sleep goes deeper on the sleep evidence. Do I take ashwagandha in the morning or night covers the timing question. And when to take ashwagandha covers timing across different goals.