Are you having any other symptoms. You've been pretty down , sometimes not being able to sleep is because of depression or anxiety, like the not being able to be still. I wouldn't get too worried yet if you aren't having other symptoms.

Do you have any sleep meds? You should make sure that you don't end up missing another nights sleep, that's really important. If you are having other symptoms than contact your pdoc right away. Don't wait for it to come to full swing. Mania is hard to control if you leave it until it's full blown. It's nit like depression where there are lots of tools and skills to bring you out of it.

Do you have safety nets for when you are manic? Like for me, I will absolutely not drink, not gamble, not put my releshonship at risk....spend ect. You have some insight into your last mania, which you can use to help you get though the next, hopefully with less repercussions.