You should take at least two showers a day one in the morning
and one at night. But if you can't take a shower in the morning you
should at least take one shower a day because its better that not
taking a shower at all.
I have taken this med many times for sinus infections and I have
taken it both morning and night, and the morning is the best time
to take it. The time I took it at night I was woken up at 3 am to
severe stomach cramps and had to sit in the bathroom for an hour ,
so morning is the wisest :)
If you don't want to sleep that night, then just pop 1, 2, or so
and you won't. Joking, you really should take it in the morning
because it causes many people to feel energetic, and you want that
for the daytime, not nighttime unless you are a night owl.
If you forgot to take your birth control pill the night before
and you take it the next morning instead, what could happen is that
you may not be protected from pregnancy. You should use another
form of contraception, such as a condom, for the next 7 days if you
want to prevent pregnancy.