I haven't noticed that at all with Splenda - NutraSweet really does, though, plus it causes a lot of stomach pain. In twenty years, I think it will universally acknowledged that aspartame is a poison.
but it could be my body chemisty, although my wife experiences similar results. Sometimes in after eating something with Spenda in it, we have a "symphony". Fortunately, there seems to be no odor with the sound.