Based on the description provided, it sounds like Patricia is most likely abusing a stimulant. Stimulants are drugs that increase alertness and energy, which could explain why she feels she can stay up all night and complete her work. Common prescription stimulants include medications for ADHD, such as Adderall (amphetamine) and Ritalin (methylphenidate). If she is using these drugs outside of a doctor's guidance and for non-medical purposes, that constitutes misuse or abuse.
If you have concerns about her behavior or well-being, it may be best to encourage her to seek help from a healthcare professional.