What is normal sleep latency:-
Normal Sleep latency is about 20 - 40 minutes Any sleep latency less than 8 minutes is abnormal and quite characteristic of Narcolepsy. REM latency is different from sleep latency, as it is the time taken to enter the first REM phase during sleep. This is about 90 minutes.
20 minutes
120 minutes
60 minutes
90 minutes
Sleep Disorders