Best Of

If anyone else is experiencing something similar and has any tips I would be interested.

A few good face slaps does wonders.
I have seen and experienced severe torpor. A bowl of water in front of ones meditation cushion should stop you hitting the floor with your head. 😶 Yes that happens.

In a more gentle way. I find it is temporary. There is usually a cause as @how mentions eg.

• the presence of advanced/relaxed practitioners
• too warm
• not enough ventilation
• need to temporarily change practice for example to walking meditation or chanting

I often meditate with a mug of green tea. As long as drinking mindfully, it works simply ...
https://buddhism.stackexchange.com/questions/29835/managing-slaps-and-torpor-in-meditation

To put this in dzogchen perspective. Mindfulness is not something you enter or leave when meditating.
Maybe try changing your posture to a balance yoga asana or if you have a spare cat place it on your head.

I remember a time long ago when I was meditating and my mind was running so vivid and fast that I actually realized I had gotten up and was upstairs doing something. I asked on a forum of meditators what I should do and someone said to tie my shoe laces together when I meditate

Mindfulness - losing it

It's called having a senior moment