10.9 is high-ish but not particularly THAT bad, certainly not high enough to make you sleep/tired or give you headaches etc. Everyone is different right enough so...
What insulin are you using? at the end of last year, on my Doctors advice, I changed my night time insulin from Insulatard to Lantus. This lasted a month, Lantus was making me feel so tired I could have lay down on the ground and sept. I changed back to Insulatard and within a week I was back to normal. I was quite angry at my Doc. for making me do something I didn't want to. Maybe it is your insulin.