Suzy, I am not trying to scold but you really should be getting more sleep. I know what it is like the first few weeks and you sorta run a high and can't sleep but you need to.
If I hadn't had my husband I would've only slept about 4-5 hours a night but he literally drug me to bed kicking and screaming. I was so glad he did because whenever it got to be about a month later I was sooo exhausted all the time and I know it would've been worse had I not slept when Dan made me.
I don't know though, maybe it is because you are so young that you can do it. I am an old geezer and I can never get enough sleep anymore.