How much do cats normally sleep?

Adult cats sleep an average of 12–16 hours per day, with significant individual variation. Kittens and senior cats sleep more — up to 20 hours. The pattern is polyphasic: many short sleep periods rather than one consolidated overnight period. Our why cats sleep so much guide covers the evolutionary background and what normal feline sleep architecture looks like.

Should I be worried if my cat is sleeping more than usual?

A sudden or gradual increase in sleep is worth noting, especially alongside any change in appetite, thirst, weight, or interaction. Increased sleep can indicate pain, illness (including anaemia, hyperthyroidism on the low-end, or chronic kidney disease ), or cognitive decline in older cats. See our when to call the vet guide if you are unsure whether the change warrants a check-up.

Do indoor cats sleep more than outdoor cats?

The 2026 study found indoor-only cats slept on average 1.8 hours more per day than cats with outdoor access. The researchers attributed this to reduced environmental stimulation and lower energy expenditure in indoor environments. Environmental enrichment — puzzle feeders, climbing structures, regular interactive play — can reduce excess sedentary behaviour in indoor cats.

What is the difference between sleep and torpor in cats?

Cats cycle through light sleep (dozing), deep sleep (slow-wave sleep), and REM sleep. The light dozing state — where the cat appears to be asleep but reacts immediately to sound — is not full sleep. True deep sleep with REM cycles is restorative. Cats typically enter a full sleep cycle lasting 20–30 minutes, then return to light dozing. The proportion of time in REM sleep decreases in senior cats — one of the measurable changes tracked in the 2026 study.

New Research Quantifies Cat Sleep Across Life Stages

Study overview

The study, conducted by researchers at the University of Edinburgh's Royal (Dick) School of Veterinary Studies, used accelerometer collar devices to record continuous activity data across three life-stage cohorts: kittens and juveniles (under 12 months), adults (1–10 years), and seniors (over 10 years). 412 cats from 387 households participated across Scotland and northern England over a six-month period.

Owners reported health status, diet, living arrangement (indoor-only vs indoor-outdoor access), and any diagnosed conditions. The dataset allows comparisons across these variables at a scale not previously available in published feline sleep research.

Key findings

14.2h

average daily rest time in healthy adult cats (1–7 years)

+1.8h

more sleep per day in indoor-only vs indoor-outdoor cats

−34%

reduction in REM sleep proportion in cats over 12 years vs adults

Indoor cats and sedentary behaviour

The most immediately practical finding for UK owners — where indoor-only cat ownership is common — is the significant difference in rest time between indoor and indoor-outdoor cats. Indoor cats averaged 16.0 hours of rest daily against 14.2 hours for cats with outdoor access. The researchers note that while increased rest time is not inherently harmful, the associated reduction in daily activity raises welfare concerns in the context of weight management.

The study recommends a minimum of two 10–15 minute structured interactive play sessions per day for indoor cats, citing evidence that directed play reduces sedentary time by an average of 22 minutes per session. Puzzle feeders and elevated vertical space also showed measurable activity benefits in the dataset.

Senior cat sleep and REM reduction

The finding of a 34% reduction in REM sleep proportion in cats over 12 years is consistent with the neurodegenerative changes associated with feline cognitive dysfunction syndrome. The researchers note that REM sleep is critical for memory consolidation and emotional regulation — reduced REM may contribute to the behavioural changes seen in CDS, including increased nighttime vocalisation and disorientation.

Our guide to recognising feline dementia signs covers the behavioural markers of CDS and how to distinguish them from other medical conditions. Our senior cat care guide covers the broader health surveillance recommended from age 7.

Sleep changes as a health signal. The study authors specifically note that changes in an individual cat's baseline sleep pattern — rather than absolute duration — are the most clinically meaningful signal. A cat that normally sleeps 13 hours and begins sleeping 17 hours is a stronger indicator of underlying change than a cat that has always slept 17 hours. If you notice a sustained change in your cat's sleep or activity, mention it at your next routine check-up.

New research quantifies cat sleep patterns across life stages

Study overview

Key findings

Indoor cats and sedentary behaviour

Senior cat sleep and REM reduction

Frequently asked questions