For about 3 months after my DH died the bed side light would turn on after I had turned it out and was dropping asleep. It never worried me at all and I got a great sense of comfort from it. I was sad when it happened less and less then stopped.
It once happened around the same time when I stayed at a friends house. Her bed side light turned on. She lept out of bed frightened and I explained it had happened at home etc.(We were sharing a bed,due to her having no spare bed and no DP!) She was really upset because the lamp was broken and hadn't worked for months!
I firmly believe they do make contact in what ever way they can.xx