as:

 

• • Streetlights outside
  • Glowing electronic screens
  • Illuminated clocks
  • Hallway or bathroom lighting
  • With age, we tend to become more sensitive to light and subtle disturbances.

 

2. Shifts in the internal clock (circadian rhythm)

Another common cause is a shift in the body’s internal timing system.

Many older adults feel sleepy earlier in the evening. If someone goes to bed at 9:00 p.m., their body may naturally complete its sleep cycle around 3:00 or 4:00 a.m.

 

This isn’t always insomnia — sometimes it’s simply a new rhythm.