The classic mistake here. If you regard this tree a houseplant it will die. Many people buy bonsai and love to be near them but unfortunately they live outdoors in full sunshine (as in the case of this juniper) so that is their domain. You can however bring them inside for a few days on special occasions but they must be misted every so often and i would not place them beside a heater or on top of the television.
I suggest you enrol with one of the many bonsai clubs near you or in the short term do a search on basic bonsai care here in bonsaiTALK.
Regards Ash
