How can someone fall immediately into REM sleep if technically it’s not until the 4th stage of sleep?

Question

How can someone fall immediately into REM sleep if technically it’s not until the 4th stage of sleep?

In: 222

Answer 1

if you look at narcolepsy, people go into REM almost immediately upon falling asleep; this is what is tested for during the MSLT (along with sleep latency), so its entirely possible. Its a disruption in the sleep cycle.