As the title says, I went home earlier today because I feel ill.
I got back from holiday on Monday and I'm really struggling with jetlag. This combined with the jitters of my first day at a new job, meant that I didn't sleep at all last night.
I showed up to work and went around and met everyone, and sat down to start reading all their procedures. A few pages in I realised I'm just too exhausted to continue, and I excused myself and told them I had to go home to get some sleep.
How can I best handle this? I feel terrible and I don't want them to get an idea I'm some flaky person. I'm planning on showing up early tomorrow morning and get on with it, and apologise to my manager for going home early.
Are there any other ways I can limit the damage done by my early departure?
Update: just to clarify a few things, I got back from holiday on Monday and arranged to start on Wednesday to give myself some time to recover from the jetlag. I've done this trip before, and had the same amount of time to rest and I was fine. I think the combination of jetlag and the fact I was nervous for my new job caused the extreme lack of sleep. As I mentioned in the comments, in hindsight I should have just started next week, so I have more time rest.
In the end, I apologised to my manager and colleague and they were very understanding. I offered to take the day as unpaid leave and were gonna sort something along those lines. Ironically, I ended up barely sleeping again last night, because I was more nervous than ever because of the situation I put myself in. This time I pulled through and I'm making sure I go to sleep at a normal time to get my sleep schedule under control as fast as possible. Thank you all for your input!