I'm the same in that I normally need a lot of sleep, 9 to 10 hours. When I see my sleep going down to 6-7 hours that's often a pretty good indicator that hypomania is coming. I've had nights of no sleep a few times during hypomania, but usually it's around 6 hours.

For me, quality of sleep is also an important indicator of the type of mood I'm in, and it's something that I log in my mood charts as well for that reason. Sleeping 9-10 hours and feeling good is usually something I experience only during euthymia. 10+ hours and still feeling exhausted happens during depression; it can either be solid but unrestful sleep, insomnia (but being too tired to get out of bed), fitful sleep, etc. Sleeping around 6 hours usually happens during my (hypo)manias. If I'm sleeping less but I don't miss it and I'm just too excited and wound up to sleep, then it's probably euphoric mania. On the other hand, during dysphoric mania I'll often desperately want to sleep, but I can't because my mind is racing and I have too much anxiety. This is just me, other people may have a totally different experience.

Another thing I would add that took me a while to realize is that the criteria for bipolar as described in the DSM are stereotypes. The particulars of BD will be different for everyone. For one, your baseline personality will affect how the symptoms express themselves. Additionally, as others have mentioned, not everyone with BD experiences all the symptoms. I believe that's a large part of what distinguishes a good psychiatrist -- being able to accurately diagnose people beyond those stereotypes.