Nice program!
I used to use Sleepy before, but this is nicer looking. (more candy)

What I am missing from Sleepy, is to able to see several sleeping times (nights) top of eachothers to visually compare.
Also Sleepy will tell how much "deep" sleep was there.
Similarly SleeyAnalyzer could tell total cumulative time of those Green, Dark Green, Red, Light Red zones....and maybe also max length of those.
In example: Your "max deep sleep" (light green) was 20 minutes long, total 2h 10m.

Horizontal scrolling of diagram with finger and not just with arrow-buttons would be nice.

BTW, not really about sleep, but this same program could have an option to alarm when just some treshold of movement in some selectable time period have occured. Maybe alarm could be a slient phone call and/or SMS message also. Could be usefull as a burglary alarm inside of luggage or attached to a hotel door.

Could be a separate program, but the internal logic would be so much similar to SleepAnalyser this could be included also IMO.
Besides, the name "SleepAnalyzer" would then also mean it analyzes if N900 is not disturbed by shaking, moving or tilting. Let N900 "sleep" or it acts. Some optional delay, so SMS is not send if owner STOPs the delayed alarm.