After like 6 weeks of sleeping at 4-6am and waking from 3-6pm I managed to flip my sleep routine back to normal.
Spent last saturday awake for about 22 hours, before sleeping for until around 6am, then slept on sunday night at around 11pm, woke up at 8am.
Was so tired on Monday that I fell asleep at about 8pm, and I missed Game of Thrones. Woke up at 6 the following day.
And since then I've been getting to sleep around 10-12pm and waking around 6-8am.