I also have been watching the series of lectures with Huberman and Matt Walker as I have been having issues the past few months with either being unable to fall asleep or waking up and staring at the ceiling for hours (not recommended). There are several in the series, but the most recent one i watched discussed caffeine, lighting, not staying in bed, etc. I became more stringent in implementing these and have noticed some improvement. Here's the 2nd in the series:
Some Timestamps
00:05:30 Basics of Sleep Hygiene, Regularity, Dark & Light
00:12:05 Light, Day & Night; Cortisol, Insomnia
00:18:45 Temperature; “Walk It Out”; Alcohol & Caffeine
00:26:05 Sleep Association, Bed vs. Sofa
00:29:43 Tool: Falling Asleep; Meditation, Breathing
00:36:37 Alcohol & Sleep Disruption
00:49:25 Caffeine - None after noon, if possible!
01:02:04 Cannabis: THC vs. CBD, REM Sleep, Withdrawal - THC suppresses REM sleep - CBD can be helpful, but only if you take enough. Hard to know how much you are getting.
01:12:03 Sleep Hygiene Basics
01:20:23 Tool: Sleep Deprivation & Exercise
01:24:11 Insomnia Intervention & Bedtime Rescheduling, Sleep Confidence
01:32:58 Wind-Down Routine; Mental Walk; Clocks & Phones
01:50:07 Temperature Manipulation, Warm Bath Effect & Sleep, Sauna
02:04:36 Acoustic Stimulation, White Noise, Pink Noise
02:34:12 Acetylcholine, Serotonin, Peptides; Balance