After 11 p.m. all patrons must leave any floor above the 2nd. Remnants of food and drink encourage nasty things like bugs and vermin that damage the collection. However, you may bring in plain water in closed, clear containers. Please be careful, even with water, as you are working with library materials and computer keyboards. Even plain water can cause serious damage.
All libraries are smoke-free environments.
However, please supervise them closely and try not to let them disturb others. Look for them in glossy brochures displayed in the lobby areas. My professor has put some readings for our class on reserve. The Reserves Room in McKeldin Library is on the third floor. Other libraries hold reserves materials at the circulation desk.