Does my car have a mind of its own or what?

First I thought my alternator was going with the car dying randomly, now this! I go to start car this morning: 38 degrees out, not too bad, Ive seen worse. Its been sitting over night. Glow light comes on. Glow light goes out. CHUH CHUH CHUH CHUH. Nothing. I do it again. Glow...same thing. Oh my god I say to myself...third time...4-5 "Chuh's" and it fires up. Maybe now that its getting colder I should wait more time after the glow plugs go out? Usually I wait 10 or more seconds more, but I didn't think it'd make a difference. Drove it rest of the day stop and go without any starting problems....WTF?