| Notes | |
| Increased | |
| Nocturnal awakenings | |
| Daytime napping | Likely due to the above |
| Nocturnal sleep latency | Time to fall asleep during the day is longer or unchanged |
| Snoring | |
| Decreased | |
| Total sleep time | May be offset by daytime napping |
| Sleep efficiency | Ratio of time asleep to time in bed decreases likely due to nocturnal awakenings |
| Rapid eye movement (REM) latency | Time to get to REM sleep is shorter |
| Percentage of time in REM | |
| Slow wave sleep | 20% in young adult to 10% by 70 years |
| Daytime sleep latency | Time to fall asleep during the day is shorter |
| Other | |
| Phase advance | Feel sleepy earlier in the evening and wake up earlier in the morning |
