Above is a time series chart of when I go to bed. The date is on the horizontal axis and on the vertical axis is the hour at which I go to bed. Zero is midnight, -1 is 11:00pm, 1 is 1:00am, and so forth.
You can see from the chart that a major change in average bedtime occurred at the beginning of February 2009. This happened because I changed jobs from working part-time during the afternoon to working 9 till 5.
Normally what happens is I wake up at 6:30 in the morning on Mondays to Fridays. However, on weekends I normally stay up late, which is what causes those spikes to appear. About a week ago I went to a sleepover, and I stayed up till 5:30 in the morning for that. This explains that major spike towards the end of the chart. As you can see, I adjusted for that by going to sleep really early the following day.
What I have only just noticed from plotting the data is that the volatility of my bedtime seems to be increasing over time. My sleep is becoming more and more erratic, which may not be good for my internal body clock.
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