cervical collar after ACDF

Hello,
I just had ACDF 5&6 and 6&7 with fusion. I have to wear the collar 24/7 except when showering. I am 9 days post op and miserable. Trying to sleep is impossible. This is my second time around doing this so I am not surprised. Just wondering, how many of you had to wear the collar after your ACDF and for how long. My surgeon has it on for 12 weeks. My first surgery was 3&4 and is nicely fused. I know this is for the best. Just curious how other's have done without the collar. Thanks.