if you feel it's something sinister, you could do a cleansing and protection, but specify all spirits who wish you harm must leave.
question on the glass however, how do they break? meaning it could be a pet knocking them over and you don't notice, or it could be heat [like a candle in a jar] while i have heard stories of spirits breaking glasses, you do need to rule out logical answers first. of course a routine cleansing and protection is a good habit to get in to. [and as someone who has lived with spirits they'll be fine so long as you specify your intent]