Hi and welcome soniad
Firstly, you are trying a very good form of HRT - well done for asking for this.
HOWEVER, you are over thinking things way too much
It is very early days on the HRT, it's summer and the weather is very humid at the moment, so sleeping is difficult anyway - I doubt very much that it's the HRt causing your sleep issues.
That low a dose of oestrogen will take some time to kick in so the sleeping problems you are describing are about you being anxious and looking for side effects and probably nothing to do with the oestrogen. Oestrogen is not a stimulant - it is a natural hormone that allows your body to function better generally. In my experience oestrogen gives me better quality sleep - progesterone can have a slight sedative effect but this varies from women to women.
Your sleeping problems could well be more to do with a lack of oestrogen or fluctuating hormone levels which are typical of the peri meno stage. As the HRT stabilises your hormones then you will start to feel better and this can take 2-3 months, or even longer, after starting HRT.
This low dose of oestrogen will probably take 3-4 weeks to really start taking effect. I bet you will find your sleep will start to improve over this time. BE patient, try to relax and don't look for problems. Keep us posted. DG x