The simple answer is anxiety. Some people have a lot of anxiety and have to medicate to manage it. Others have very little and only experience it occasionally. If you find yourself feeling this way often, I would suggest seeing a professional. If you only experience it occasionally, perhaps try some breathing exercises to calm yourself.
Not a scientist but it seems to me that you are busy and distracted all day and don’t have time to focus on what it is you are worried about until you lie down and have nothing going on.
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The simple answer is anxiety. Some people have a lot of anxiety and have to medicate to manage it. Others have very little and only experience it occasionally. If you find yourself feeling this way often, I would suggest seeing a professional. If you only experience it occasionally, perhaps try some breathing exercises to calm yourself.
Not a scientist but it seems to me that you are busy and distracted all day and don’t have time to focus on what it is you are worried about until you lie down and have nothing going on.