What might be some of the problems encountered by researchers when trying to study sleep in a laboratory setting?

Asappp which of the following is not a requirement for an adult to become a u. s. citizen? have been born on u. s. soil pass a u. s. history and government test be a legal, permanent u. s. resident swear loyalty to the united states

Choose any two countries in the world, and briefly discuss the evolution of the government of these countries.

Doing the text now can someone me