Between this book and Michael Mosley’s “Just one thing”, I’ve decided that for me personally, coffee is for mornings only as caffeine takes about 10-12 hours to leave the bloodstream.
There are pros to coffee, including some beneficial health impacts on the brain so I’m not in a massive rush to stop drinking it.
Like you, I’m experimenting a bit more around intake.
I try to have my latest coffee by around 1pm which seems ok for me generally. Interestingly though, if I have been out late and need to drive home, I have occasionally had coffee late at night and have still slept well afterwards so the impact on sleep isn’t always as bad as I would expect.
The book goes into more detail on the impact to sleep and it wasn’t so much impacting the quantity of sleep but the quality.
Without giving too much of the book away, it was more about the type of sleep you get and the impact over time.
I think the impact over time is the key with a lot of things. You can do a lot of things once in a while and it won’t do any real harm but they can be harmful if you keep it up over an extended period of time.
