Late winter SAD is a different beast for older adults

Managing SAD in late winter for people over 65 is uniquely difficult because age has already done a number on their circadian clock. You’re fighting against the season and the body’s natural decline at the same time.

The aging circadian system tends to phase advance — older adults naturally get sleepy earlier and wake earlier. Late winter’s long nights and grey days amplify that shift, and standard bright light therapy (the go-to for SAD) can backfire if timed wrong. Hit them with morning light when their clock is already pulled too far forward and you might make it worse. They need careful timing, sometimes afternoon light instead, and that’s not something most light box instructions cover.

On top of that, many older adults produce less melatonin, their eyes transmit less light to the brain due to lens yellowing or cataracts, and they’re more likely to be vitamin D deficient from staying indoors. So they’re getting less benefit from the same interventions that work for younger people. And late winter is when SAD symptoms peak — right when seasonal fatigue also gets blamed on age or illness.

If you’re helping an older adult with SAD in late winter, don’t just hand them a light box and call it done. Check their vitamin D, consider an eye exam, and work with a doctor on timing of light exposure. The standard playbook often needs a rewrite.