Ever get that feeling?

Ever get that Friday feeling of simultaneous relaxation and exhaustion?

Struggled to get out of bed this morning, staying put for a full 9 minutes after my tightly scheduled last allowable getting up time.

Somehow got to work at the same time as normal.

Double Year 10 this morning which I'm looking forward to.

Meeting prospective future science teachers this afternoon which should be good.

15 miles to run tomorrow morning. Do I hold out until Sunday or do I just get it over and done with? I know the answer, but...