What happens to my heart when sleep?

What happens to my heart when sleep?

Chris Idzikowski (Director of the Edinburgh Sleep Centre) gives expert video advice on: What happens to my brain when I sleep?; What happens to my muscles when i sleep?; What happens to my breathing when I sleep? and more...

The heart rate will go down initially and continue going down into deep sleep. But again, during rapid eye movement dreaming sleep, an emotionally excited time of the brain, it can become much more rapid and irregular.