The trick is making sure the "guest" doesn't turn into a "guest every day, but he doesn't live here, really, I promise, he just sleeps over on weekends. and weeknights. and holidays."  

I never sleep.

another newbie and may be she has researched it enough.The person kept saying Donald Trump is not sleeping these days because he thinks next two years are greatest time for Real Estate…I won’t forget that…JAnyway, anyone heading to Black Diamond event on Mar 24th in Waltham, Massachusetts?

We eat, sleep, and breathe income properties :)

They are loud in the middle of the night and make it hard for him to sleep.

Get and follow the recommendations to the letter and you will be able to sleep easily at night.

I'd guess it would be very hard to sleep which would limit your potential customers greatly. 

Once I get back home I give my wife a break from our daughter and once I put her to sleep, back on my iMac researching and studying (usually until 1am).

We lived like monks throughout school, eating rice and beans, riding our bicycles in the rain to class, traveling/sleeping in our Honda CRV for vacations, and working internships during the breaks to save for our downpayment.

Lose sleep over those you didn't buy.