Sleeping bag liner

Sleeping bag liners are lightweight cloth sacks usually fitted inside sleeping bags to provide extra comfort, insulation, and help keep the sleeping bag clean.^[1][2]

A thin liner may feel softer against the sleeper's skin, add 5 °F warmth to the bag (not pad), and be easily washed after use (unlike the thicker sleeping bag). A thick, fleece-like liner can increase warmth by 10-15 °F. Liners also allow a sleeper to use the liner alone, without the bag in hot conditions.^[3] Optionally, bug-repellents, pockets, and a pillow holder can be added to liners.

A vapor barrier liner (VBL) is special type of liner that blocks the sleeper's moisture from reaching the bag, thus stopping evaporative heat loss. Usually a sleeping bag liner is used inside a VBL.

Sleeping bag liners are issued as basic kit by various militaries including the US and British armed forces.^[4]

Fabrics

Liners are made of silk, cotton, nylon and polyester among others;

Silk liners

light, soft and strong and retain much thermal insulation even when wet

Cotton

heavier and bulkier than silk and absorbs water

Synthetic [mix]

usually light, strong, and do not absorb water

See also

• Bivouac sack – a small, lightweight, waterproof alternative to larger tent-like shelters
• Mosquito net – a type of meshed curtain that is draped over a sleeping area, to offer protection against bites and stings from pest insects, and thus against the diseases they may carry

References

Stages of sleep cyclesBrain wavesSleep disorders

Anatomical	Bruxism Mouth breathing Sleep apnea Catathrenia Central hypoventilation syndrome Obesity hypoventilation syndrome Obstructive sleep apnea Periodic breathing Snoring
Dyssomnia	Excessive daytime sleepiness Hypersomnia Insomnia Kleine–Levin syndrome Narcolepsy Idiopathic hypersomnia Night eating syndrome Nocturia Sleep state misperception
Circadian rhythm disorders	Advanced sleep phase disorder Cyclic alternating pattern Delayed sleep phase disorder Irregular sleep–wake rhythm Jet lag Non-24-hour sleep–wake disorder Shift work sleep disorder
Parasomnia	Nightmare disorder Night terror Periodic limb movement disorder Rapid eye movement sleep behavior disorder Sleepwalking Sleep driving Sleep-talking
Benign phenomena	Dreams Exploding head syndrome Hypnic jerk Hypnagogia / Sleep onset Hypnopompia Sleep paralysis Sleep inertia Somnolence Nocturnal clitoral tumescence Nocturnal penile tumescence Nocturnal emission
Treatment	Sleep diary Sleep hygiene Sleep induction Hypnosis Lullaby Somnology Polysomnography
Other	Sleep medicine Behavioral sleep medicine Sleep study Neuroscience of sleep

Daily life