Sleep (Cycle, EEG Waveforms, Pathology) 

Same I got that question wrong. Mixed it up with night terrors.

I also did wrong this question in uworld 🙁

@@georgenaratadam3803 whats the difference between nightmares and night terrors and where does night terrors appear?

@@Ifeany1 You can remember nightmares (happen in REM sleep). You cant usually remember night terrors and they happen during N3 (sleep walking happens during this stage as well.

Thank you for your comment

best comment award thanks for the tips! (And thanks for the humour

And in nightmare the brain 🧠 uses a lot O2.

I had that exact question last night lol

came here for same reason

nightmares can be remembered whereas nightterrors cannot be remembered also nightmares are seen in REM sleep . there is Locus ceruleus mediated paralysis in REM sleep

i,m also confused with this. In UW OSA increases in REM< but here is in N1.

OSAS increases in REM sleep due to muscle Atonia which affect throat muscles and breathing muscles Except diaphragm. When Apnic event occurs it’s usually followed by brain arousal and then going back to sleep via N1. So Sleep apnea causes increase in N1. I hope this clarify the point.

Delta waves are part of N3. Otherwise, good mnemonic

The will be gradual decreases in the length of each period of N3 and increases in the length of each period of REM. They go opposite of each other. The first 3 hours of sleep you have more N3 and the next 3 hours toward morning you have more REM

Thanks for being a Dirty Medicine member!

yes!

In the past NREM used to be 4 stages: 1, 2, 3 , and 4. Now it’s only N1, N2, and N3. REM latency is 90 minutes which the time from Sleep Onset to the beginning of REM sleep. How sleep stages progress? It usually start with N1 then N2 then N3 then REM. Most of the time REM occurs after N2 because as we progress into sleep toward morning there is a gradual decrease in N3 and gradual increase in REM. N2 is 50% of total sleep so it spreads throughout the night and is usually followed by N3 or REM. N1 occurs at beginning of sleep and sometimes after brief arousal or awakening and it’s 5% of total sleep. I hope this is helpful.

Marla

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I think you are confused. A REM period lasts 90 min. If you get 8 hours of sleep a night that is 480 minutes. 90/480 - 18% roughly.

@@DirtyMedicine 90 min / 0.15 = 10 hrs, 120 min / 0.15 = 13.33 hours 10-14 hrs

@@chaosawaits your math would work if there were 100 minutes in an hour. There are only 60 minutes in an hour so Dirty's calculations are correct.

@@kyleseljaas8584 omg, no 90 min / 0.15 = 600 min = 10 hrs 120 min / 0.15 = 800 min = 13.33 hrs REM takes up 20-25% of sleep, not 15%, given an 8 hour sleep schedule

@@chaosawaits yeah i'm gonna side with you here. i don't think a single rem period ever lasts that long. it occurs at such intervals sure, that one sleep cycle (rem making up 20-25% of it) lasts 90 minutes. so total rem sleep in one night would amount to 90-120 min..