First Day at work

The struggle is back and I'm having major doubts again. Today was my first day of work after two weeks holidays in a comfortable home environment.
I was very alert during the day. I started the preparation for work after my 4am nap. I did some yoga, made my lunch and breakfast, had very long, luxurious shower and set off for the road at 6.30 am. I didn't feel sleepy on my journey. It was a tough one as the snow was constantly attacking my front window. The first snow this winter. It turned out a beautiful, crispy and sunny day. Unfortunately I had to spend it in the office :(
The quality of my naps at work were very poor and that's why I think I'm so tired now. I just couldn't go to sleep straight away and some naps went even without the sleep.
For the last two weeks I was sleeping in a warm, cosy bed and now this was replaced by a yoga mat on the floor with a small cushion and my coat as a blanket.
I'm sure tomorrow I will be sleeping very deeply on that floor.
I had a little dip in energy at around 2pm during the Italian class, which by the way went very well. I recovered very quickly after having few sips of my tea.
I'm wonderig if the quality of my sleep had something to do with the tea I brewed this morning. It was a mix of Pau d'arco and green leaf tea. Some schools say there is a fair amount of caffeeen in the green tea others say the trace is so minimal that it doesn't efffect us in a any way.
I think that it has some efect on me.
In the early evening at my pilates class I was falling asleep. I came home and had a wonderful nap in my bed. However my energy was still not restored. I spent all evening on the sofa watching tv with my family. I didn't feel like doing anything else. I wasn't sleepy but I just lacked in energy and alertness.
After the midnight nap I felt better but still not myself. It's 2.32 am now and I have already been outside few times to fully wake up. It has been a struggle.
I think I have to allow myself few days to get back into the routine of going to work and sleeping on the floor again.