In adults, a typical night’s sleep ____ tend to prevail during 1st half, ____ tend to prevail in the last half
- REM and NREM Stage 1; NREM stages 2 and 3
- NREM stages 1 and 2; REM and NREM Stage 3
- NREM stages 3; REM and NREM Stage 1
- NREM stages 1 and 2; NREM stages 3