When I started working night shifts, my circadian rhythm has never been the same even after adaptation to the change in shift hence why I need my multivitamins (twice a day) to keep me going. One thing I noticed was that at work I would hit a wall at 4am, then as soon as I'm home say.....around 8:30ish I become invigorated lol. Qutie annoying especially when I need to sleep so I can be ready for the gym and then work.
I remember when I didn't realise about my condition I was constantly lethargic and when I use to consume large amounts of simple sugars, I basically had written myself off (never ending urination/thirst). Such a bad experience after you realise your blood glucose level being at 30mmol/L and not far off elapsing into a coma.