Before you make any decisions about retirement take a week off work if it is possible. Even if you have to use a little sick time. Getting off third shift can mean a new out look on life. I have worked it several times in the past and it makes my life miserable.

Look at the money situation. If you can afford to not work and you are unhappy than do it.

A change of jobs may be what you need. Being in the same work environment can get pretty stale after awhile.

Good luck and God Bless you in your decision. Ryan