Fix it
Sleeping Pad Losing Air Overnight? Fixes (2027)
Why your sleeping pad deflates overnight and how to fix it: leak hunting, valve checks, and field repairs that hold.
Waking up on the cold ground at 3 a.m. is a rite of passage no one wants twice. Most deflation has a findable cause: a pinhole, a valve issue, or simple physics as night air cools. Work through these fixes in order before blaming the pad.
Pad slowly deflates every night
Hunt the pinhole properly: inflate the pad firmly, close the valve, and submerge sections in a tub, or spray soapy water and watch for growing bubbles. Mark the leak, dry the pad fully, and apply the manufacturer's patch with firm pressure for several minutes. Field patches applied carefully routinely last the life of the pad.
Pad is softer in the morning but has no leak
That is physics, not failure: air you inflated warm in the evening contracts as temperatures drop overnight, and altitude changes do the same. Top the pad off before bed after it has cooled, and expect to add a breath or two at high camps. If the pad is flat on the ground, though, you have a real leak.
Valve leaks or will not seal
Inspect the valve for grit, hair, or a twisted gasket; rinse it clean and reseat it. WingLock and similar valves seal by rotation, so confirm the deflate wing is fully closed. A valve that still hisses after cleaning needs a replacement core, which major brands supply cheaply.
Pad feels cold despite holding air
Check that you are not expecting a summer pad to do winter work: R-2.0 foam under you on a 25-degree night will feel cold no matter what bag you carry. Stack foam under inflatable to add R-values, and in camp, clear snow and sharp debris from the tent floor that both chill and puncture.
Questions, answered
Can I repair a pad at camp without a tub?
Yes. Inflate it hard, listen for hissing, and feel with a wet hand or cheek; air movement gives most leaks away. Lakes and streams work as dunk tanks too.
Do patches hold long-term?
Properly applied adhesive patches on clean, dry fabric are effectively permanent. Most failures come from patching a damp or dirty pad in a hurry.
When is a pad done?
Delamination, where baffles separate and the pad balloons, is terminal and usually a warranty claim. Pinholes and valve issues are almost always fixable.