karlc, it is okay doing this for short bursts, but as Paul quite correctly states, it is no good over a prolonged period. Please try and get some sort of balance and at the very least try to discuss your situation on a face to face basis if at all possible; can you perhaps talk to the people or organisation associated with your degree or people associated with your two jobs.I feel onthe edge of burnout again.
With two jobs and a fulltime masters degree to work on, I really need a break (not had any time off anything since September last year)
Things are usually tough in order to progress, but they should not be too tough or indeed for severely extended periods.