uk-sleep

It can sometimes belie other conditions.
If you always feel groggy when the hours shift, this could be seriously useful.
If you're doing either of these, you may want to see a doctor ASAP.
It seems odd that something I use so often never shows up in my sleep.
If you're waking up in the early hours of the morning, one doctor has said that's "partially because [of] our body temperature".
The post-lunch slump may not be as inevitable as it seems.