If you have Alexander Technique lessons you will become very familiar with lying in semi-supine on the floor at home with your head on a small pile of books (and of course, it can be practiced on any flat surface, anywhere). It has the following benefits:
It is always best to find a teacher who will show you how to lie in semi-supine and find the right height of books to support the head (everyone is different). But even if you decide not to have lessons, you will gain benefit from practising it regularly. Here is a nice video showing you how:
Ideally, aim to practise lying in semi-supine at least once a day for a period of 15-20 minutes, but if you find you are becoming stiff and uncomfortable, get up. It should always be a pleasurable experience, not a chore.
The Alexander Technique works ... I recommend it enthusiastically to anyone who has neck pains or back pain."
Roald Dahl, writer