HELP!! My hair wont stay straight for a long period of time?

Every night, I take a shower and then go to bed. When I wake up, I have my natural waves and then I straighten it. The problem is, that when I finish straightening it, by mid-day it's not even as straight anymore. I don't use hairspray or anything, so could that be the problem? Because most of my hair stays straight, but the part that kinda flips is the part around my face. The two sides kind of flip inwards and frame my face.. I HATE IT. Would it be better to shower in the morning, and use hair products before I blowdry? Let me know. :)