Sleep Tracking

Updated February 28, 2026

Sleep tracking records duration and quality signals so recovery plans are based on trends, not single-night noise.

Minimum reliable metrics

Metric	Minimum reliability window	Action signal
Duration	at least 5 nights of trend	repeated dips below target window
Sleep efficiency	3 to 5 nights trend	fragmentation reduction first
Resting heart rate	steady baseline with week trend	sharp rise may signal fatigue or illness load
HRV	weekly average changes	sustained drop suggests nervous-system fatigue
Wake events	recurring wake cluster	prioritize environment and caffeine review

Signal	Pattern	Likely impact
Appetite drift	late-evening cravings increase	higher food cue reactivity and lower protein adherence
Training quality	repeated missed targets	weaker reps and endurance pacing
Recovery window	low readiness despite good duration	hydration and stress likely lagging recovery

Trigger pattern	Immediate adjustment	Follow-up
3 nights with low efficiency	use sleep-hygiene protocol and reduce late stimulation	keep intervention for 5 nights before retraining
persistent wake spikes	reduce evening alcohol and caffeine windows by 50%	recheck next week, then reduce training volume if unchanged
low mood and appetite spikes	add recovery day and nutrition pacing changes	escalate to training deload plan if 7 nights continue
noisy wearable-only trend	pair with manual logs for at least 1 week	compare against body weight and energy logs

Check	Rule
Device quality	use one device for 2 weeks before conclusions
Labeling	mark bedtimes and caffeine as context
Threshold confidence	avoid changing plans on one-night swings

Combine these metrics with sleep hygiene, recovery time, and hunger-aware macro planning for robust adjustments.