I have a British Army Bivvy bag with drawstring and a mummy sleeping bag.
My 'usual' mode of use is to sleep with no tarp so I get 360 view, which is nice.
My problem is I'm not a contortionist so once I'm fully zipped in the sleeping bag with the sleeping bag hood drawstring closed I can't easily get to the bivvy bag drawstring to pull that tight.
As Autumn arrives and there's more dew I might want the drawstrings of the Bivvy Bag and Sleeping bag tight to keep warm and the dew off.
Is there a technique to achieve this without being a Houdini-like escape artist?
I don't really want to go down the tarp/hoop route.
Thanks in advance.
My 'usual' mode of use is to sleep with no tarp so I get 360 view, which is nice.

My problem is I'm not a contortionist so once I'm fully zipped in the sleeping bag with the sleeping bag hood drawstring closed I can't easily get to the bivvy bag drawstring to pull that tight.
As Autumn arrives and there's more dew I might want the drawstrings of the Bivvy Bag and Sleeping bag tight to keep warm and the dew off.
Is there a technique to achieve this without being a Houdini-like escape artist?
I don't really want to go down the tarp/hoop route.
Thanks in advance.