December was my fourth month of biphasic sleep, and brought about some changes to my schedule. First let's have a look at my sleep chart for December:

If you want to view this chart with all of the mouse over comments go here:December Sleep Chart.

The main thing you might notice when comparing this chart to previous months is that (apart from the Christmas period) my sleeping pattern has shifted slightly, and I am going to bed before midnight and getting up at 5:00am. This wasn't something that I intended to happen: I just missed my nap one day and ended up going to bed early and my pattern shifted. I think the main reason that I kept it earlier like this is that I like going to bed at the same time as Yu Lee, and as she normally goes to bed between 11:00 and 11:30 this earlier bed time means we can fall asleep together which is always nice.

The other thing that happened this month is that my overall hours slept increased again. The following is a breakdown of how much I slept each day:

In November I slept for an average of 7:15 each day, and in December it was slightly higher. December would have probably averaged 7:30 per day if I'd have been able to sleep more easily over the holiday period, and I think this is probably the amount of sleep that I actually need on this sleeping pattern. Before I was trying to sleep between 6 and 7 hours but in the end this probably wasn't enough sleep, as I ended up oversleeping most days and struggling to get out of bed. Since I have shifted my sleeping pattern and started going to bed early I have found it much easier to get up when my alarm goes off and have also frequently woken up before my alarm (often at 4:30am).

Another thing that started to happen this month was that I had a few days where I woke up extremely early. The first time this happened was on the 18th of December when I woke up at 2:00am, and then it happened again on the 23rd of December when I woke up at 1:30am. Both times this took me by surprise, and I have no idea why it happened, but I don't think this is too alarming and it almost looks like my body was trying to fall into a segmented sleeping pattern which is actually a very natural way to sleep that was very common before the industrial revolution.

The final thing that I want to talk about in today's post is my sleep mission. I have been saying for a while that I wanted to mark my new sleeping regime as a success, but that the Christmas period would be a real test of whether it has worked or not. From the sleep chart at the top of this page it may look like I have been successful, but I feel that my sleep pattern got messed up on New Year's Eve:

I stayed at Yu Lee's mum's house for the new year, and although we went to sleep straight after midnight I was rudely awoken by one of the noisiest house parties that I have ever heard! To view all of the comments for that day go here: New Year's Eve Sleep Chart.

To cut a long story short I had a very interrupted night's sleep, which ended up with me sleeping in until 8:00am which in turn stopped me from napping. Last night I went to sleep no problem and today I did manage to get up at 5:00am as intended, but I have felt tired all day. I had an amazing 2:45 hour nap today and feel good, but I just want to be sure that my sleeping pattern easily goes back to normal before I say that this has been a complete success.

Expect another post in the next day or two!