A survey of over 3,000 people discovered that over the past three years the time we go to bed has been put back 54 minutes.
Hectic work schedules, busy lifestyles and money worries are said to be the main reason for the increasingly-late bed time.
It was also found that nearly half of people are still up at midnight and one in ten are still awake at 1am.
More than half of people (55 per cent) said they end up falling asleep on the sofa at least twice-a-week… and not just because they are in trouble with the missus.
Researchers also discovered the average Brit gets just over five-and-a-half hours of completely uninterrupted sleep every night - two an hour-and-a-half less than the recommended amount.
TOP 10 THINGS WHICH KEEP US AWAKE
1. Work stress
2. Money worries
3. Partner snoring
4. Outside noise i.e neighbours, traffic
5. Need a drink
6. Nightmares / A bad dream
7. A niggly noise (e.g. dripping tap, air in the central heating system)
8. Eating too late in the evening
9. Having too much caffeine
10. Relationship worries
Professor Leeds, of Cambridge Weight Plan, which carried out the research, said: "The fact Brits' heads are hitting the pillow nearly a whole hour later than three years ago is worrying.
"Your body needs rest so the lack of sleep could be affecting people's performance at work, their personality and outlook on life.
"Everyone is so manic these days that once we have fallen through the front door after work, had dinner, sorted out the kids, and finished watching TV it's so late.
"Some of us are even too tired to get off the sofa and climb into bed or nod off regularly early on in the evening."