breakage

I just noticed that all my hair closest to my neck has broken off to about seven inches or so. Now, my
hair reaches the middle of my back so that`s several inches of breakage. I colored my hair several
times some years ago so most of the ends are very dry and have split ends but not as much as the
"neck" hairs. Does anyone have an idea why this may be happening? And if there is anything I can do
to prevent it from breaking further? I also need your help with recommendations on tying my hair up
before going to bed. I am a restless sleeper and my braid and bun come undone after one hour or so.
Thanks a lot!!!!!