Half bags are weird but there are a few (lighter) options:
https://www.theomm.com/product/mountain-raid-pa-1-0/ (synthetic) http://www.phdesigns.co.uk/full-three-quarter-and-half-length-sleeping-bags-for-bivouacs-bivvys
I have an as yet unused full PHD bag so I won't be buying a half bag (yet).
I do like the idea of a top bag with the addition of a NeoAir.
@hippy started
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Half bags are weird but there are a few (lighter) options:
https://www.theomm.com/product/mountain-raid-pa-1-0/ (synthetic)
http://www.phdesigns.co.uk/full-three-quarter-and-half-length-sleeping-bags-for-bivouacs-bivvys