A man who first started struggling with insomnia following the death of his week-old daughter 10 years ago says he fears his "body will give out".
Council dog handler Dan Hill, 51 and from Warrington, said he typically only sleeps for two to three hours a night.
According to the NHS, adults on average need at least seven hours.
"I think it will kill me and that's properly dramatic I know," he said, adding: "It's something that I've got used to - it's part of my day-to-day."
Mr Hill said the situation was "not getting worse [nor] better. This is the hand I've been dealt.
"And difficult though it may be, at some point the body will give out."
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Mr Hill said he had experienced severe insomnia since the death of his seven-day-old daughter Isabella in July 2013.
"Getting to sleep isn't the issue," he told BBC North West Tonight. "I can be awake again within an hour and that could be for any reason.
"It could be a knock at the door. It could be a dog barking. It could be someone walking past and that's me again for the day.
"It's not a case of going back to sleep because that's just not possible."
Last week, Mr Hill decided to keep a sleep diary.
Over those seven days he recorded a total of only 17 hours' sleep.
He said he often found himself running on "auto-pilot" during the day.
"When you get home it's about trying to switch off," he said.
"But if you've only got six hours before you're going back in again, you can't switch off.
"Likewise you can't take any sleep remedies because you have to be awake again for the next shift."
What is insomnia?
You have insomnia if you regularly:
- Find it hard to go to sleep
- Wake up several times during the night
- Lie awake at night
- Wake up early and cannot go back to sleep
- Still feel tired after waking up
- Find it hard to nap during the day even though you're tired
- Feel tired and irritable during the day
- Find it difficult to concentrate during the day because you're tired
Mr Hill said he believed insomnia was far more common than most people realised.
"Nobody I know has gone to a doctor and said 'you know what, I'm really struggling sleeping' because their lives just don't allow for them to take a tablet and fall asleep for 12 hours because they've got children to get up for school," he said.
"They have got things to do and things like that. And I think sleep deprivation is a massive issue.
"It has health implications. It has working life implications, relationships especially. It needs addressing."