Well, all I can suggest is sitting closer to the TV or bringing the sensor bar closer to you. Also playing with the sensitivity settings can help.
I've never really had that problem. At home, my TV is right in front of my bed. At my girlfriend's place, the range can be a little flaky if I lean back into her lounge. I think that would be about 2.5 metres. I always have my sensor bar under the TV.
06/02/2008
Mario and Sonic at the Olympic Games
Gold Coast, Queensland, Australia