Sleep
The number one reason people relapse in the first month.
If you take one thing from this whole toolkit, make it this. The sleep problems are temporary, and they're the single most common reason people go back. Night three or four with no proper rest, staring at the ceiling, and the thought arrives: "one joint and I'd sleep." That thought is the withdrawal talking, and it passes. Knowing why it's happening makes it much easier to hold the line.
Why your sleep falls apart
Cannabis suppresses REM sleep, the dreaming stage. Use it nightly for long enough and your brain adapts to running short on REM. Take it away and the brain rebounds, cramming in the REM it's been missing. That rebound is exactly why the dreams come back so vividly, sometimes disturbingly, and why sleep is broken and shallow for a while. STRONGEvidence strength Regular cannabis use suppresses REM sleep; stopping produces a "REM rebound" of more intense, vivid dreaming, along with insomnia and reduced sleep quality during withdrawal. It's one of the best-documented parts of cannabis withdrawal. Key source: Angarita et al. (2016), Addiction Science & Clinical Practice. A comprehensive review of sleep abnormalities across substances, including cannabis withdrawal and REM rebound.
The vivid dreams catch nearly everyone off guard, because no one warns you. They aren't a sign of anything wrong. They're a sign your sleep architecture is repairing itself. Unsettling as they can be, they're a good omen.
What actually helps
Tighten your sleep routine. Same bedtime and wake time every day, weekends included. A dark, cool room. No screens for the last hour. The blue light and the scrolling both work against you when you're already wired.
Move your body earlier in the day. Physical tiredness helps you drop off, but hard exercise late in the evening can keep you up. Aim for daytime or late afternoon.
Watch the caffeine. When you're exhausted it's tempting to lean on coffee, but caffeine after midday will make the nights worse. Cut it back earlier than feels natural.
Have a 3am plan. If you're wide awake and fighting it, don't lie there escalating. Get up, keep the lights low, and do something dull and screen-free. Read a few pages, make a herbal tea, then go back when you feel sleepy. Fighting insomnia feeds it.
On melatonin and sleep aids. Some people find melatonin or a wind-down routine helps, but the evidence for melatonin specifically in cannabis withdrawal is thin, and it's not a magic fix. THINEvidence strength There's limited direct evidence for melatonin or other over-the-counter aids resolving cannabis-withdrawal insomnia specifically. General sleep-hygiene measures have better support. A pharmacist can advise on what's safe to try. See the Angarita et al. (2016) review for the state of the evidence on sleep in withdrawal.
When it normalises
For most people sleep starts to settle within two to four weeks, and the vivid dreams fade as it does. It's a slog while it lasts, but it's one of the clearest examples of withdrawal being a phase you pass through rather than a new normal. Hold on through the fortnight and your own, un-chemical sleep comes back.