Your body sweats on average half a liter of water every night. This may make you feel more tired in the morning.
By drinking some nice fresh water, you can make up for that and feel energetic much faster. Also, nice cold water feels refreshing in the morning, helping to wake you up as well.
Cheers!
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Especially important if you drink coffee in the morning or eat sweet stuff for breakfast, as those withdraw even more water from your body.
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Been doing this for a bit, about 300-500ml get the job done.