Then he developed early - morning headaches with nausea a... (discovermagazine.com)
(e.g. People would search for «morning headache» usually in the morning after getting up from bed..) (saadkamal.com)
4) And no matter how much water I drink the day before, I'll always wake up with a desert - dry mouth, and dull, throbbing headaches later on if I don't drink enough of it that morning (ababyonboard.com)