My family's boat had both inline bunks and one large enough to sleep athwart. As the youngsters, my brother and I shared a forward cabin with inline bunks and during normal conditions it was comfortable enough, but when in high following seas or beating in choppy conditions, the pitching fore and aft would make sleeping very difficult.
The time where sleeping athwart became critical is when we got caught in a cyclone while crossing the Indian Ocean
. 20 days of gale force wind
and very high seas, and before long the only place one could get any sleep was in the aft berth where you could lie athwart.
With this experience in mind I designed the interior
of my current
boat with the bunk running side-to-side. I will be able to always sleep with my head
on the high end.
As for the "crawling over", I can say that it really did not bother me when I had to endure it. My current
boat is set up for single
handed operation and as such this is a moot point for me.