Any miracle remedies for lack of energy and motivation?

[Bree98]

I have a serious lack of energy and motivation and i have a lot of work deadlines coming up that I need to get through. Can anyone recommend anything that can help? I have tried some weird herbal teas that are supposed to help you get deeper sleep but they didn't seem to work and I've tried organizing my sleep schedule to make it regular and drinking lots of water but that didn't work either
Thanks

*Just a small note, I am UK resident, just in case certain remedies etc cannot be found here.