One person explained how they’d wake up at 7am to shower and get ready and “feel like throwing up”. Why do I feel sick when I wake up early? “That, coupled with having an empty stomach, stress hormones, and lack of sleep can make you feel quite queasy.” According to BASS Medical Group, low blood sugar can contribute to morning nausea and lightheadedness. To reduce the chance of this happening, Dr Rubin suggested getting to bed earlier if you plan on having an early start.