I noticed in recent years I was beginning to sleep less. There were some nights where I found myself waking at 3-4am and having to use the toilet. Occasionally I’d be awake for an hour or two only dropping back off at 5am. Shortened sleep is something older people often find happening and apparently comes with ageing. At least that’s the received wisdom but since I recommenced training hard with more sprints and workouts, yet doing no more mileage, I’ve started sleeping very deeply again.
Growing up I was always a deep sleeper. Some of that was because I wanted to stay up late as a teenager; I was often up until gone midnight, then struggling to get out of bed the next morning. Waking me up for school was a nightmare for my parents and I would often go in still half asleep. When I began working, I still stayed up late and slept deeply but always got up to be on time for work. I’d make up for lack of sleep at the weekends, often sleeping in until almost midday, sometimes a nap in the evenings.
For a short period I kept a sleep diary. Or rather compiled a list of how much sleep I got. There’s probably an app you can get to do this automatically on your phone now. But, back in the late 1990s, I was bored in my job so one small way I passed the time was to log an estimate of how much sleep I’d got the previous night.
What fascinated me was that after collecting three months’ data (yes I really was bored enough to do it for three months) my average sleep for the first month came in at 7hr45, the second month it was 7hr50 and the third it was 7hr40. My body knew what it needed and that was just under eight hours sleep each night. In the week I was working 8-6; so long sleep-ins at the weekend were the adjustment to get me back on track.
It’s apparent to me that the body is doing a lot of rebuilding and healing work between training sessions. I was all-out when I played sport in my twenties. I pushed every session to the limit to the point where it would actually leave me very moody and antisocial and on the verge of depression. The body’s chemistry is in fine balance and sleep is one of the ways it resets itself. The long hours of sleep were a necessity rather than a luxury.
I remained a deep sleeper until a few years ago. I reckon I started sleeping lighter when I figured out how to train aerobically. Even now, despite sleeping deeply because of the 800m training, when I run back-to-back recovery days on Friday and Saturday, I need less sleep on the second night. Somewhere within this is a lesson about the interaction of hard training, speed, miles and sleep. It seems logical to me that if you’re not sleeping deeply the body hasn’t got much to repair in which case you’re not training to get faster.