Objective sleep parameters

Number of posture shifts

Younger group

Senior group

Total minutes scored as awake (TMSA)

n.s.

0.36*

Wake after sleep on set (WASO)

n.s.

0.48*

Sleep efficiency (SE)

n.s.

−0.47**

Sleep on set latency (SOL)

n.s.

n.s.

Activity index (ACTX)

0.48**

0.37*

Sleep fragmentation Index (SFX)

n.s.

0.38*

Wake episodes (WEP)

0.38**

0.44*

Long wake episodes (LWEP)

n.s.

n.s.