Core sleep: 03:00-08:00 (went to bed late and didn't get to sleep straight away so only got 5 hours again)
Nap: Didn't! (had forgotten about a meeting which got in the way and I was just too busy to find the time. But at least it shows that I can move a nap or not take one at all and still manage the day without too much tiredness.)
Core sleep: 02:00-07:00 (woke up an hour early as I messed up my alarm!)
Nap: 11:30-13:00 (woke up after 45 minutes but then went back to sleep)
I have felt fine throughout the day though maybe a little more tired than usual after 11pm. I am looking forward to my next core sleep which begins in 40 minutes. It's a bit annoying that my core sleep is a full 6 hours, I wish it was 4.5, but I think that I shouldn't try and push myself too much yet and plan on getting into the schedule before reducing the number of hours.