Human Body feed
REM atonia
During normal rapid eye movement sleep, most skeletal muscles lose much of their usual tone. This temporary atonia limits dream-related movement without stopping eye movements or the breathing activity needed to stay alive.
300
Babies have more separate skeletal pieces than adults, often described as about 300 bones compared with the usual adult count of 206. The newborn number is approximate because developing bone and cartilage are not always counted the same way.
1 cm
People are usually slightly taller after a night lying down because spinal discs regain fluid when unloaded. Around a centimeter is a useful rough illustration, not a fixed daily change for everyone.