Systems, methods, and devices for custom sleep age implementation

A system comprising:

• a communications interface configured to receive measurement data comprising data values representing measurements of neural activity of at least one user;
• a processing device configured to:
• generate at least one wake model based, at least in part, on reference data, the at least one wake model being configured to identify an estimated wake age of at least one user based on a measurement data;
• generate the estimated wake age of the at least one user based, at least in part, on the at least one wake model and the received measurement data;
• generate at least one stimulation parameter based, at least in part, on the estimated wake age, the at least one stimulation parameter being configured to modify the estimated wake age of the at least one user;
• and
• a memory device configured to store the at least one wake model and the at least one stimulation parameter;
• wherein the communications interface is further configured to apply a stimulus to a brain of the at least one user based on the at least one stimulation parameter.