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How Sleep and HRV Influence Each Other

Sleep and HRV move together in both directions: poor sleep tends to lower next-day HRV, and low HRV (often a sign of an overworked nervous system) can make it harder to fall into deep, restorative sleep.

What happens to HRV overnight

HRV typically rises during deep sleep, as your parasympathetic system takes over. Fragmented sleep, late alcohol, or a stressful evening can blunt that rise, and it often shows up the next morning as a lower resting HRV reading.

Why a wound-up nervous system disrupts sleep

If your sympathetic ("fight or flight") system is still active at bedtime, from screens, stress, or a late workout, falling asleep and staying asleep both get harder. This is where a short breathing practice earns its place in a wind-down routine.

Try 4-7-8 breathing before bed

A few minutes of paced breathing signals safety to your nervous system, which can shorten the time it takes to fall asleep.

Open the breathwork tool

Tracking the pattern

A single night rarely tells you much. Logging your HRV alongside sleep for a few weeks, something IncreaseHRV subscribers can do for $5/month, is what reveals whether your evening habits are actually helping.