What causes grogginess when you first wake up – what about your brain isn’t working?
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Your brain is run by chemical reactions. Those reactions can happen very fast or more slowly, but they all take time. So, while a given reaction is ramping up or winding down, you’ll still feel it a little bit, but maybe not all the way.
When you’re asleep, your brain is full of chemicals that make you unconscious. When you wake up, those chemicals are wearing off. But they are big doses of sleepy-chemicals that last for hours on end. They don’t shut off immediately.
It kinda makes sense that you feel a little groggy when you have just stopped being asleep – you’re basically coming off some really strong drugs that are designed to have you on your ass for hours! It takes a few minutes for those chemicals to clear out of your system.
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