Before revision: Sleep efficiency is often described as the ratio between time spent asleep ("total sleep time ( STS )"), and time spent "in bed" ("time in bed (TIB)"), however, TIB does not encompass "non-sleep-related activities" performed in bed (e.g.
After revision: Sleep efficiency is often described as the ratio between time spent asleep ("total sleep time ( TST )"), and time spent "in bed" ("time in bed (TIB)"), however, TIB does not encompass "non-sleep-related activities" performed in bed (e.g.