While most mammals and birds show signs of REM sleep, reptiles and other cold-blooded animals do not. |
Some think the process is akin to REM sleep, where eye movements accompany the digestion of daytime memories. |
As soon as her telepathic abilities discern that we have reattained REM sleep, she cries again. |
The time from the first stage of deepening sleep to REM sleep is truncated. |
Histological staining techniques also confirmed that programmed cell death had taken place after the rats had been deprived of REM sleep. |
Sleep is fragmented by frequent arousals and awakenings, resulting in decreased or absent slow-wave and REM sleep. |