Weather forecasters typically avoid overconfidence when making weather predictions because they

Don't have the exact forecast because weather can be unpredictable and can change at any time.

Because without physical activity, the body has extra "energy" if you will, and so when it is time for bed you are not tired, so you end up staying up all night. also there is probably an effect on your internal clock, which messes with your melatonin production which goes hand in hand with your sleep cycle

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