Is it normal that i find it difficult to wake my baby to nurse?

No: This can actually be a warning sign for very young infants. Babies should feed roughly every 2-3 hours and for the first few weeks not feed fewer than every 4-5 hours. Sleepiness can be a warning sign for illness, infection, jaundice, etc. Once babies are gaining weight well, they generally can be allowed to sleep a little longer. Excessive sleeping should be evalutated by a physician.

Yes: If the weight gain is adequate, you are probably not giving the baby enough time to get good and hungry. If it is inadequate, more evaluation is needed.