Vergerio, de ingenuis moribus et liberalibus adulescentiae studiis, LIV:
“There is indeed good reason to gather together those times which others tend to neglect, as when we read at dinner or awaits sleep (or avoids it) by reading. Yet, the doctors tell us that these practices are bad for our sight and eyes; this is true if we read too much, that is to say, either too intently or after an excessive meal. But it will also be to our advantage if we set up, in our libraries and right before our eyes, those instruments which are used to measure the hours and times more generally, so that we may see time as it flows and slips away from us. It would also be useful if we were to use those places for nothing else than what they were established, allowing there no external business or thought.”
Bonae etenim rationis est ea quoque bona colligere quae solent neglegere ceteri, ut si quis super cenam legat et somnum quidem inter libros exspectet aut certe per libros fugiat. Quamquam physici obesse ea visui luminibusque contendunt; quod et verum est, si modo praeter modum, id est, aut intentione nimia aut super multam saturitatem id fiat. Sed et illud quoque proderit nonnihil, si intra bibliothecas nostras coram atque in oculis instrumenta haec constituamus, quibus horas ac tempora metiri solent, ut quasi tempus ipsum fluere labique videamus, et si eis ipsis locis ad nihil aliud quam ad quod instituta sunt utamur, nullam ibi aut occupationem aut cogitationem extremam admittentes.
You are correct. Reading is good for the mind and soul. You learn something different every day. You can build up your own library and read when ever you like. This means as you say, not overdoing it. Rest your eyes when they become too heavy to read any more. I know sometimes its difficult to put down a book which you are enjoying so much and can’t wait to find out how it ends.