Why should one not sleep with the feet towards the main door?
Energy keeps entering through the main door every moment, and at night spirits, devas and angels also move about and enter the house; if they find feet pointing at them they take it as disrespect, as if being kicked, and the sleeper suffers ill effects. The rule dates from when large families made some children sleep in the main door hall. For the same reason never point the feet towards the temple or God, a cow, religious books or the tijori where Lakshmi resides.
Related questions
Can asan (asana) wood be kept in the bed?
Yes. Asan wood is cheap, unlike sandalwood, and a whole bed can be made from it. If you have to sleep in a wrong zone, put asan wood under all four legs of the bed.
Do these effects, such as insomnia, apply to room doors, and does only the owner suffer?
They apply to the main door of the house, not to room doors. The people in whose name the house is and who invested in it feel the effects most, but other members can be affected too.
If a house has four members, whose kundli should be used for its vastu?
Primarily the grih swami's, the person whose money is going into the house, because the house affects the owner and his next three generations; do not go by the name the property is registered in, such as a daughter. The facing and main door are chosen from the grih swami's chart, for example North if his Mercury is exalted or his North-side planets are strong. Where a child sleeps or studies is decided from the child's own chart: if the child's Mercury is weak, seat him in the South instead of the North, following the 180-degree rule for a weak planet.
Is it true that one should not sleep near electric switches?
Yes. The more electromagnetic current there is near you, the more it affects the nadis, the body and blood circulation, so keep the bed well away from switch boards. The minimum distance is transcribed as 35 feet, which may be 3 to 5 feet; check the class recording.
Should the sandalwood be kept under the bed or inside it?
Use sandalwood (not silver) and keep it in the bed, under the mattress, so that it touches the wood of the bed.
What should be done if the TV is in front of the bed?
Cover the TV while sleeping, for example by putting a cloth or curtain over it. Electronic items should not be close around the bed in any case, as their electromagnetic currents make a person ill.