When it's 10:40 p.m. and you realize you haven't written tomorrow morning's email yet. OOPS.
When it's 11:07 p.m. and you've knocked out writing said email in under 30 minutes.
Now: BED. 
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When it's 11:07 p.m. and you've knocked out writing said email in under 30 minutes.
Now: BED. 