Having a hard time switching “off” for bedtime

I’m a SAHM of two little ones. They have my time and attention all day and night at the moment. The only me time or real down time I get is when they’re both asleep (until the baby wakes up to eat) and I usually watch my tv shows for an hour or two then go to sleep. It’s definitely become important to me to have that time to myself to just sit and do nothing and watch tv so even though I’m so tired come bedtime I stay up for a while to watch tv. Lately I’ve been having a harder and harder time turning off the tv to go to sleep and it’s not like I’m not sleepy I just can’t seem to turn off my brain and try to go to sleep it’s like I never feel ready and sometimes even when I do turn it off I struggle for a bit to actually fall asleep no matter how exhausted I am. Anyone experienced this or have any advice?