Some people are deeply, terminally grouchy in the morning — no one disputes this fact. But if you’re “not a morning person,†as such moodiness is often more delicately referred to, is this actually meaningful in some way? Does it say anything about the quality of your sleep? Or your life? Grouchiness, however long it lasts, is associated with the “sleep inertia“ phase — a transitional period of grogginess that typically lasts between five and 20 minutes after a person first wakes, though it can go on for some time longer, according to Allison G. Harvey, Ph.D, professor of psychology at the University of California, Berkeley and director of the Golden Bear Sleep and Mood Research Clinic. “The process of waking up is slow — not like a light switch, much slower,†Harvey says. “These feelings are not pleasant, but do not necessarily indicate having had a poor night of sleep.†Why some people are able to cheerfully adjoin their sleep inertia phase with the rest of their day is much more individualized and specific. Grouchiness could be associated with not getting enough rest and being tired, but it could also be be symptomatic of having a bad attitude about the day. “I would be curious if it happens every morning, or only Monday through Friday. If it is only [those days], I would guess that it is either because you aren’t getting enough sleep, and being woken up by your alarm clock when you are still really tired can make your grumpy, or if it is because you aren’t looking forward to going to work,†says Alice D. Domar, Ph.D., executive director of the Domar Center for Mind/Body Health. While not having much to look forward to could be a sign of depression — a chemical inability to see what’s beautiful about the day ahead — that’s not usually the issue, Domar explains. “For most people though, morning grumpiness is simply a symptom of our over-scheduled life, with too little sleep and not enough things that bring us joy on a day to day basis,†she says. from : https://goo.gl/0GyBrG