I have been on levothyroxine . 112last 13 years all of a sudden as a month ago my doctor says my thyroid is through the roof and she prescribed levothyroxine.137 oh now I've been taking it every day as prescribed and now I'm sleeping 13 to 15 hours a day this is not normal for me is this supposed to happen this only happens when I forget to take levothyroxine pill once every 6 months because that has happened before but not new pill making me sleep for 1315 hours I'm a little worried is this new??