Usually had a milk shake or piece of fruit
On Sunday's we used to cook breakfast at work, scrambled eggs, or a full English, (I didn't have a full English as I don't eat pork products) etc
Start of nights was 7pm on a Friday, we would have fish n chips (again no chips for me as I cannot eat potato),
A guy I worked with used to graze all night, but he only ate meat, sausages, chicken, pork ribs.
I think it is important to keep hydrated, drink lots of water, avoid coffee, it makes you feel awake for a short time then you hit a tiredness wall more coffee just makes your mind buzz and you will have trouble sleeping.
Invest in good blackout curtains, a sleep mask, ear plugs, unplug your phone turn mobile off.