Key points from article :
Healthy people had sleep limited to no more than five hours a night.
One group was able to catch up at the weekend.
Both groups snacked more at night and gained 1kg in weight.
Also showed signs of deteriorating metabolic health (less sensitive to insulin).
Recovery group saw mild improvements at the weekend, but only temporarily.
36 people studied for 2 weeks in a sleep laboratory.
The study was published in Current Biology.
