Just started taking Lisinopril about 4 days ago - only 10mg. I t...

Just started taking Lisinopril about 4 days ago - only 10mg. I take it appx. 8:00 pm - 8:30 pm. I've found myself being woken up by the alarm at 5:10 each morning - I'm generally awake around 4:00 am. I'm groggy, have a slight headache, and all day long I'm falling asleep. I'll be typing, my lids close and I wake myself up nodding to one side. Headache isn't bad, but the sleepiness is terrible. I know people who take 40mgs and they don't have the sleepiness. Plus, people say I act hyper, giddy, etc. L.