überschlafen — To sleep on something. Duden defines it as thinking over a matter that needs a decision, and taking time for it at least until the next day. Das muss ich erst noch überschlafen. I have to sleep on that first.
sich Bedenkzeit erbitten — To ask for time to think. Ich habe mir bis morgen Bedenkzeit erbeten. I have asked for time to think until tomorrow.
Kommt Zeit, kommt Rat. — When time comes, advice comes. With time, a solution will be found.
Blinder Eifer schadet nur. — Blind zeal only does harm.