Reported
What practitioners describe.
Evening cold showers and slow breathing lower core temperature and arousal; the app's guided sleep sessions and the Twenty-Day Cold Shower Challenge are built around it.
Honestly graded
What the evidence says.
Sleep improvement is widely reported by practitioners; controlled evidence is early.
Protocol
How to practice for this.
Breath
Three to four rounds each morning, seated, on an empty stomach.
Cold
End the shower cold; progress by degrees.
Commitment
Thirty days. Track it. Notice.
Safety, plainlyNever practice breathing exercises in or near water.
Personal experience, not medical claimsReported benefits are personal experiences; consult a physician for any medical condition. Read the safety doctrine.