How Poor Sleep Makes Stress Worse (And What You Can Do)

Sep 16

2 min read

Stress and sleep have an uncomfortable habit of feeding each other. Stress raises cortisol and adrenaline, making it harder to fall or stay asleep. Poor sleep, in turn, impairs the brain's ability to regulate emotion the next day — so ordinary frustrations feel bigger, and your stress threshold drops. Left unaddressed, this becomes a cycle that's hard to break from either end.

Sleep is when the brain does much of its emotional processing. During deep and REM sleep, the amygdala — the brain's threat-detection centre — is essentially recalibrated. Without enough quality sleep, that recalibration doesn't happen properly, leaving you more reactive to stress the following day. Studies have shown that even one night of poor sleep can measurably increase anxiety and emotional reactivity.

For people over 55, sleep architecture naturally changes — lighter sleep, more nighttime waking, and sometimes earlier waking overall. This is normal, but it means sleep hygiene matters more, not less, as we age.

A few evidence-based habits can help:

Keep a consistent wake time, even on weekends — this anchors your body clock more powerfully than a consistent bedtime.
Dim lights and screens an hour before bed to support natural melatonin release.
Avoid caffeine after early afternoon, since its effects can linger 8+ hours.
Get morning daylight exposure, which helps regulate your circadian rhythm and, in turn, evening sleepiness.
If your mind is racing at night, keep a notepad by the bed to jot down worries and "hand them over" until morning.

If sleep difficulties persist for weeks despite good habits, it's worth speaking with a GP — insomnia is very treatable, and poor sleep shouldn't be accepted as an unavoidable part of getting older.