How to Lower Cortisol Before Bed
August 11, 2026 · Arun Menon
Share
Cortisol, your main stress hormone, should fall in the evening so you can sleep. To lower it before bed, stop work and screens about an hour out, dim the lights, do slow breathing or a calm routine, avoid late caffeine, intense late workouts and alcohol, get daylight earlier in the day, and manage stress with methods that actually downshift the nervous system. Ashwagandha is notable here: in trials it lowered perceived stress and serum cortisol. The goal is to help cortisol drop on schedule, because a high-cortisol evening is one of the biggest blocks to deep sleep.
If you lie down wired, unable to switch off, cortisol is often the culprit. It is the hormone that keeps you alert, and in the evening it is supposed to bow out. For a lot of high performers, it does not. Here is how to help it.
Why does cortisol matter before bed?
Cortisol keeps you alert, so it should fall in the evening. When it stays high from stress or late stimulation, it keeps the brain switched on and blocks the shift into deep sleep. A healthy cortisol rhythm drops at night and rises before dawn. If yours stays elevated late, your body is chemically primed to stay awake. Lowering evening cortisol is one of the highest-leverage things you can do for sleep. See how cortisol interacts with sleep and hormones.
8 evidence-aligned ways to lower cortisol before bed
Remove the things that keep cortisol up and add the ones that bring it down: a work and screen curfew, dim light, slow breathing, no late caffeine or alcohol, earlier daylight, and stress-lowering support.
| Method | Why it lowers cortisol |
|---|---|
| 1. Stop work and email an hour before bed | Ends the cognitive stress that keeps cortisol high |
| 2. Dim lights and screens | Signals evening, supports the natural cortisol drop |
| 3. Slow breathing or a calm routine | Activates the calming branch of the nervous system |
| 4. Avoid late caffeine | Removes a direct stimulant to the stress system |
| 5. Keep intense workouts earlier | Late high-intensity exercise can spike cortisol |
| 6. Limit late alcohol | Disrupts sleep and stress-hormone balance |
| 7. Get daylight earlier in the day | Anchors a healthy cortisol rhythm |
| 8. Stress-lowering support (ashwagandha) | Shown to reduce perceived stress and cortisol |
What raises cortisol in the evening?
Late work, bright screens, doomscrolling, late caffeine, intense late exercise and alcohol all keep evening cortisol elevated. These are the everyday habits that quietly keep high performers wired. The single biggest one for most people is unfinished work and messages bleeding into the night, which keeps the mind, and the stress hormone, switched on. See how evening stress blocks sleep.
Does ashwagandha lower cortisol?
Yes. In a double-blind randomized trial (Salve et al., 2019), KSM-66 ashwagandha reduced perceived stress and serum cortisol compared with placebo. A 2021 systematic review (Cheah et al.) also found ashwagandha had a small significant benefit on sleep, in line with its role in lowering the stress that blocks it. This is why ashwagandha is framed as a stress reset rather than a sedative, it works on the cortisol side of the sleep equation.
KSM-66 as the stress reset in a full formula
REINCARN Night Reboot is melatonin-free, with Maizinol UP165 250mg, Glycine 3000mg, Magnesium Bisglycinate 300mg, L-Theanine 200mg, KSM-66 Ashwagandha 300mg, Tagara Root 300mg and Vitamin B6, for a disclosed 4,352mg total across 7 ingredients. For adults 18 and over.
See the formulaFrequently asked questions
How do I lower cortisol before bed?
Stop work and screens about an hour before bed, dim the lights, do slow breathing, avoid late caffeine, intense late workouts and alcohol, get daylight earlier, and use stress-lowering support.
What raises cortisol at night?
Late work and email, bright screens, doomscrolling, late caffeine, intense late exercise and alcohol all keep evening cortisol elevated when it should be falling.
Does ashwagandha lower cortisol?
Yes. In a double-blind randomized trial, KSM-66 ashwagandha reduced perceived stress and serum cortisol versus placebo, which is why it is used as a stress reset.
Why does high cortisol stop me sleeping?
Cortisol keeps you alert. When it stays high in the evening, your body is chemically primed to stay awake, which blocks the shift into deep sleep.
The bottom line. A wired evening is usually a cortisol evening, and the fix is to help the hormone do what it is meant to: fall. Take away the late work, screens and stimulants, add calm and daylight, and support the stress system. So the real question is not why you cannot switch off, but what is keeping your cortisol switched on?
We translate primary sleep research into practical guidance for people who lead and perform.
References
- Cheah KL, Norhayati MN, Husniati Yaacob L, Abdul Rahman R. Effect of Ashwagandha (Withania somnifera) extract on sleep: a systematic review and meta-analysis. PLoS One. 2021;16(9):e0257843. PMID 34559859.
- Salve J, Pate S, Debnath K, Langade D. Adaptogenic and anxiolytic effects of ashwagandha root extract in healthy adults: a double-blind, randomized, placebo-controlled clinical study. Cureus. 2019;11(12):e6466. PMID 32021735.
Not medical advice. For informational purposes only. Consult a qualified healthcare professional before starting any supplement, especially if you are pregnant, nursing, take medication, or have a medical condition. REINCARN Night Reboot contains KSM-66 Ashwagandha and Tagara, which are not recommended in pregnancy or breastfeeding. For adults 18 and over.
Publisher disclosure. Published by REINCARN (Zandra Life Sciences Pvt. Ltd.). Regulated as a food supplement by the FSSAI. Corrections: reincarn@zandralifesciences.com.