Once I am up I don’t find it is to bad. I have a bowl of oat bran or muesli about an hour before bed the night before then fuel depending on the workload of the workout. This morning was Lamarck so I had a 500ml bottle of carb drink and 12 jelly babies ready to go. I had 3 jelly babies in each valley - I think that was more psychological than anything. I get showered and have some choc milk and then drive to work and have some muesli at my desk at work.
I don’t get too tired during the day. Can occasionally feel it after lunch but finish at 3 and normally perk up for hometime but that might just be work! Desk based job so doesn’t affect me too much.