"deep sleeper" is correct and usable in written English.
You can use it to refer to someone who is difficult to wake up or someone who sleeps very soundly. For example, "My son is a deep sleeper and I can never wake him up for school in the morning."
Accidents and bedwetting are often dismissed with excuses like, "kids get busy and forget to go" or "he's a deep sleeper".
As a deep sleeper who slumbers through lightning, noisy neighbours and my partner's snoring – perhaps unsurprisingly the Lumie Bodyclock didn't wake me up.
Always a deep sleeper, slow to arouse (I had lied to Briggs), I was at first unconscious of what had happened when the iron cot rolled me onto the floor and toppled over on me.
One night, after rolling over and over in bed until 4 30 without a wink of slumber, I burst into howling tears, waking my boyfriend, a deep sleeper who once nearly slept through a robbery in our bedroom.
Assuming you're not a super deep sleeper, that should do the trick.
Chapman was part of a ring of so-called "deep sleeper" agents from American suburbs paid to penetrate US policy-making circles.
Eventually, after the last few stragglers — the deep sleepers, who had to be wakened — make their way out, the few outward-bound passengers take over the train.
Deep sleepers, however, would likely sleep right on through it.
It can be particularly helpful for little ones who are deep sleepers.
The next step, he says, will be to see if the deep sleepers are also more resistant to the ill effects of sleep deprivation.
At the moment they are particularly interested in using their brand new lab to study ordinary deep sleepers and also people who have trouble sleeping because they have painful conditions like fibromyalgia.
