The Hindi Nasal tone

Whenewher you speak in Hindi, there is this nasal tone that is incorporated without any specific matra or punctuation for it. There is no letter to say you have to go nasal... everyone just does it. Like "mein" or "haan". The weird thing is, although in the Roman script, the nasal is implied by the n at the end of the word, in Hindi, the nasal comes at the BEGGENING of the word. To use an alternative to illustrate, its "mew" not "mew". So what? Nothing really... just something I noticed...