Didn't sleep well last night? That's probably because you're suffering from 'Sunday-somnia'.
Millions of Britons are tossing and turning at the end of the weekend as they dread the working week ahead.
One in five of us finds it nigh on impossible to nod off with Monday morning looming large, with 56 per cent of those who are sleepless on the Sabbath getting less than four hours.
Jason Ellis, professor of sleep science at Northumbria University, said we need about eight hours of shut-eye a night to feel the full restorative benefits. The average Briton has six-and-a-half hours.
'While having too little sleep every now and then won't have a massive impact, consistently not getting quite enough sleep, combined with one night a week of very little sleep, will have a significant impact on health, alertness and general mood,' Prof Ellis said.
'Sunday-somnia is something I see a lot and it is important that individuals deal with the issues surrounding the sleep deprivation so that it doesn't have a knock-on effect on sleep later in the week.'
Do you have trouble sleeping? Find some tips here from Silentnight sleep expert, Dr Nerina.