why are the leaves on my dracaena marginata falling off

They do naturallly lose leaves and mine is tends to drop more around this time of year. If its watered and care for well and isnt in any drafts or direct sun, i cant see there is any problem!

Over watering? Do you allow it to dry off for a week or so between waterings?

Nickyt08 is right also in that many older leaves will drop too.

TO much water also causes stem rot and it goes 'squishy' and dies too