yep I've been waking up at 5 and getting home at 6 for the past 4 years really so I'm used to it now
I make sure I have breakfast normally weetbox as it's quick or an up and go if desperate although not the best for you or a banana.
have a healthy lunch with some protein ( chicken, tuna etc) and lots of veggies/ salad/ fruit. limit sugar etc as it just males you tired when it wears out. snack on nuts and fruit/ veg sticks during day and drink lots of water
I also take a multivitamin as I work with kids so always sick.
I also have been walking half hour in afternoons if I'm home before it's dark as it gives you a burst of energy ad is healthy for you too!
don't sit on couch as that just makes me more tired around 6pm so I usually try and be up making dinner, folding clothes etc before I retire to the couch around 7 and in bed by 8-9. I never sit on couch before 7 now otherwise I feel tired