Before I could read, my mother used to read me Alice in Wonderland, and Through the Looking Glass and all of the A.A.Milne poems (but not the Pooh Bear stories - strangely!) When I learned to read for my self, which I did reasonably early, the books that I can remember reading and re-reading were the Mary Plain series, about a bear cub in the bear pits at Berne.
Later on, the William books, by Richmael Crompton were my absolute top favourites. I had a complete set of them which I read time and time again. Also Wind in the Willows
I also discovered R.M.Ballantyne's stirring adventure stories, such as Coral Island and all of R.L.Stevenson's books. I was also quite an afficionado of the W.E.Johns Biggles books.

But throughout my life, reading has been something of a vice - I am totally addicted to it, and will read the telephone directory if there is nothing else to hand (it's surprising what interesting things are to be found in the TD!!)
Like you, MG, I read under the covers, at mealtimes (if Mum wasn't there!) during boring lessons, early in the morning and late at night. And I loved to savour the words - I didn't learn to "speed read" until a few years ago and still think it is a terrible thing to have to do! (But how else can you mark three essays an hour?)