Sleep / Wearable and app-data analysis
Phone in bed is not neutral
Personal and Ubiquitous Computing. 2022 / PMID 36405389
Use as a sleep-latency and routine audit, not as a diagnosis of insomnia or a guarantee that phone removal fixes sleep.
Sleep and cravings drop
Phones, caffeine, sleep, and late-night cravings
A reviewed source cluster on bedtime screens, late caffeine, poor sleep, appetite, and why night cravings should be treated as a pattern audit before a willpower story.
Reviewed takeaway
One move. One guardrail. Then the source trail.
- Coaching move
- Run a seven-night sleep setup test: phone away from bed, caffeine cutoff, and a simple late-night snack log.
- Claim guardrail
- Do not claim one sleep habit explains every craving. Keep the claim tied to sleep quality, appetite signals, and repeated behavior patterns.
Exact answer pages
Read these Geebs answers for narrower questions.
Phone and sleep answer
Does using your phone in bed hurt sleep?
Phone use in bed is not neutral for many people. It can keep the brain engaged, expose you to light at the wrong time, and push sleep later. The useful coaching move is not a perfect evening routine; it is getting the phone out of the bed environment first.
Caffeine and sleep answer
Does caffeine before bed hurt sleep?
Caffeine before bed can hurt sleep for enough people that it deserves a real audit, especially if late training, pre-workout, or afternoon coffee keeps showing up before bad sleep. The coaching move is not panic; it is testing timing, dose, and consistency.
Sleep and cravings answer
Does poor sleep cause cravings?
Poor sleep does not guarantee cravings, but sleep restriction can make appetite, snack intake, training quality, and decisions harder to control. The useful coaching move is to audit the sleep pattern before treating late-night cravings like a character flaw.
PubMed source trail
Primary sources behind this reviewed drop.
Sleep / Randomized pilot trial
Restricting phone use before bed helped sleep
PLOS ONE. 2020 / PMID 32040492
Call it a pilot trial and avoid over-selling magnitude. The practical point is behavior design, not a universal cure.
Sleep / Controlled crossover study
Bright screens can push sleep later
Proceedings of the National Academy of Sciences. 2015 / PMID 25535358
Do not claim all evening screens wreck sleep equally. Frame as light-emitting screen exposure before bed can delay sleep biology.
Sleep / Randomized controlled trial
Late caffeine can still hit sleep
Journal of Clinical Sleep Medicine. 2013 / PMID 24235903
Do not claim everyone needs the same cutoff. Use as a reason to test timing, dose, and personal response.
More reviewed drops
Keep the reviewed science trail connected.
Protein and recomp drop
Protein, fullness, and body recomposition
Training and longevity drop
Lifting, cardio, and longevity without the false choice
Cravings and food environment drop
Cravings, food environment, fasting, and calorie control
Creatine and strength drop
Creatine, lifting, and aging without supplement hype
Cardio and fat-loss drop
How much cardio, HIIT, and steady work belong in a fat-loss plan
Fat loss and muscle drop
Losing fat without dieting the muscle off
Free weekly email
Get the next reviewed science drop by email.
One study cluster, one practical coaching move, and one guardrail so peer-reviewed research turns into action without overclaiming.
Weekly Science Drop
Get one useful peer-reviewed finding each week, with Kris's practical takeaway and the claim guardrail so you know what the research does and does not prove. No spam, no fake certainty, unsubscribe anytime.