Here some links to a chart and some Q&A on ths cicadian rhythms.
I'd be intrested to know if his spike in BP goes along with this chart. Remember this example this person goes to bed at 10pm so if your bedtime is later you would move the times what ever the difference would be.
http://tinaheyer.com/CircadianRhythmChart.html
http://www.nigms.nih.gov/Education/Fact ... hythms.htm