Four in five adults are now binge-watching television series as catch-up technology continues to grow in popularity.
That's despite a third saying it leaves them missing sleep.
A quarter of those polled by OFCOM say they watch loads of shows in one go - because they don't want other people to ruin them with "spoilers".
The report has also found that young people are watching a third less live TV than in 2010, favouring internet catch up and streaming services.
On average, 16 to 24-year-olds watch one hour and 54 minutes of TV a day, compared to three hours and 32 minutes across all age ranges.
Lindsey Fussell, OFCOM consumer group director, said: "The vast majority of people said they found binge-watching relaxing, enjoyable and that they were glad to do it. But young people, interestingly, said it gave them something to talk about with their friends."
Kim Buckley has this report:
