The doctor tells Helen that to avoid complications to her concussion she must stay awake for the next 18 hours. Over the years, Hollywood script writers have popularized many silly notions like this. In reality, sleeping with a concussion is perfectly acceptable and often quite beneficial.
Another popular Hollywood take on medicine is the idea of the five stages of grief, which proceed in regimented order. In reality, while that can be a useful framework, grief processing can occur in completely random, recursive cycles and repeat throughout the bereaved person's life. It also doesn't apply universally to all human cultures. On the other hand, it's possible Lowell is one of the lucky ones to speed right through as he does here.
We learn Roy sneezes like a little baby.