Our liking for modern technology may be disrupting our sleep.
Many people admitted checking texts, surfing the internet, or playing games in bed.
It suggests one in four people now regularly sleeps in a different bed from their partner, and many often go to bed at different times.
The average midweek bedtime is between 10pm and 11pm, says the survey.
The survey shows that more than half of us regularly feel so tired at work that we would like to go home, with one in eight people feeling that way three or four times a week
One in ten of the 1,400 people questioned said their bedtime routine included saying prayers - but charging up mobiles and other gadgets was a higher priority, with 22% mentioning this.
Some traditions are still going strong, however, with pyjamas still the most popular choice of nightwear.
Two out of five people said they rarely went to bed at the same time as their partner, and one in three said bed was a good place to make phone calls, or send texts and emails.
One in five visited social networking sites such as Facebook while propped up with pillows, or listened to their MP3 players.
Some bedtime drinks are also not guaranteed to aid sleep - while water, cocoa and other milky drinks are still popular, 9% of those surveyed said that coffee was a nightcap, with another 9% opting for alcohol.
All of which adds up to a potentially poor night's sleep, says the council.