I check my emails typically when I wake up. I have three accounts that come to my phone, 2 personal and 1 work. I'll scan and see if anything is important and, if not, will wait until later to actually read. I check my work email accounts when I get to work as well (my secondary job's emails don't come to my phone).
I don't check my email before going to bed, usually, b/c I only have 10 hours between the end of one work day and the beginning of the next, 2 of which are spent traveling and 1 hour of which is spent getting ready for work.