PHYSCI CM123
Neurobiology of Sleep
Lecture and discussion. The registrar has published a final exam time.
Fall 2026: 1 lecture and 3 discussions. Nothing here is open. The oldest of these readings was 12 hours ago.
Also listed as NEUROSC CM123 (closed, 34 of 34 · 1 over enrolled, limited): the same class, and each department holds its own seats and its own grade history.
Grades
3.94
Average grade awarded in PHYSCI CM123. Not a student rating: this is what the grades were.
In the A range
97%
of the 188 letter grades
D, F or W
0.0%
of every letter grade awarded, plus withdrawals
Taken pass/no pass
-
the registrar has this letter grade only this term
The registrar's own records: 188 grades over 4 terms, Fall 2021 to Fall 2025. Every instructor is pooled here.
What is inside that record
No summer session is in that record.
The table below splits them, and term averages across those 4 terms ran 3.83 to 3.98.
Historical grades for COLWELL, CHRISTOPHER S, across recorded terms. The course summary above includes all professors.
- A+ 33 · 17.6%
- A 132 · 70.2%
- A- 17 · 9.0%
- B+ 3 · 1.6%
- B 2 · 1.1%
- C 1 · 0.5%
- I 2 of 190
Percentages are of the 188 letter grades. Grey bars are non-letter outcomes: incompletes (I).
How the non-letter outcomes are counted
They are excluded from the GPA entirely rather than scored, because counting a P as a 4.0 would be a fabrication.
By instructor
| Instructor | Predicted GPA | Raw | n | Terms | A range | Workload | Fall 2026 |
|---|---|---|---|---|---|---|---|
| COLWELL, CHRISTOPHER S reviews ↗ | 3.94 | 3.94 | 188 | 4 | 97% | - | Closed |
| PAUL, KETEMA NNAMDI reviews ↗ | 3.96 | 3.97 | 112 | 2 | 99% | very light | not teaching it |
| POE, GINA ROCHELLE reviews ↗ | 3.96 | 3.97 | 112 | 2 | 99% | - | not teaching it |
| NWAOBI-PETERSEN, SINIFUNANYA ELVEE reviews ↗ | 3.96 | 3.96 | 70 | 1 | 99% | - | not teaching it |
| RICKETTS, EMILY reviews ↗ | 3.96 | 3.96 | 70 | 1 | 99% | - | not teaching it |
Why Predicted is not the Raw average
“Predicted” is shrunk toward the course average, which is itself shrunk toward the department, so an instructor with a handful of students sits near the course mean rather than topping the list.
Grade records describe outcomes. For what a course is like to take, read student reviews written on dibs below or follow the separate external review link.
Workload and assignments
Reported assignments across instructors and terms. This term's syllabus may differ.
What the work looks like
- Quizzes mentioned, no number given, 2 mentions in past reviews
- 1 paper, 2 mentions in past reviews
- 1 presentation, 1 mention in past reviews
Based on 8 reviews; source checked about 1 month ago. dibs counts only what a review actually states, so a kind of work nobody mentioned is absent rather than zero.
What comes first
The chain dibs can see is 6 courses long before PHYSCI CM123. This is a floor, not a deadline: dibs has not read a class page for CHEM 20B, LIFESCI 30B, MATH 3B, NEUROSC M101B, PHYSCI 111A, and PHYSCI 111B, so the real chain can only be longer than this, never shorter.
Counted in courses rather than quarters: dibs does not know which of them a department lets you take together.
In Falls
Ran in 4 of the last 5 Falls.
From the terms dibs holds, which start in Fall 2021 and exclude summer. A department can run a course in a quarter it never has before.
From the registrar's catalog
(Same as Neuroscience CM123.) Lecture, three hours; discussion, one hour. Requisites: courses M101A and M101B or 111A and 111B or consent of instructor. Detailed look into science of sleep. Cellular and molecular mechanisms of falling asleep, many discrete brain structures involved in control of sleep wakefulness, and homeostatic regulation of sleep. How our sleep needs shaped by our evolutionary history, age, and gender. Latest insights into question of function of sleep, critical role sleep plays in memory formation and, close association between sleep and metabolism. Sleep disorders are considered as they provide insights into mechanisms underlying sleep. For background on science of sleep and circadian rhythms, completion of course C126 is highly recommended. Concurrently scheduled with course CM223. Letter grading.
Sections in Fall 2026
Choose an open discussion to enroll; an open lecture alone does not mean a seat is available.
Seat counts as of : the oldest of these 4 readings. Seat readings are snapshots, not live availability. Their timestamps show when dibs last checked.
-
Seats
ClosedLecture: 70 of 70 · 2 over enrolled
Instructor
Colwell, C.S., Nwaobi-Petersen, S, Paul, K.N., Poe, G.R., and Ricketts, E.
3.94Predicted GPA
Historical records for COLWELL, CHRISTOPHER S; 188 letter gradesSeat risk
high risk3 discussions, none open. No waitlist listed.Every discussion, with its time and seats: 3 discussions
Final enrollment, averaged across each term's sections: between 35 and 70 a term over 4 terms, summer excluded, most recently 70 in Fall 2025. That is the shape across years, not this term, which is above.
From the people who took it
Student reviews
What taking PHYSCI CM123 was like: the work, the teaching, and what students wish they’d known.
Your experience could be the first.
No student reviews are available to read on dibs for this course yet. Took it? Tell the next person what helped, what was hard, and how you spent your time.
Looking for more perspectives?
External reviews are separate and do not count toward the dibs rating.
Seats over time in Fall 2026
How each lecture has filled since dibs first saw it.
A dot is a reading where something moved: the seat count, the status, or the waitlist.
What a flat run means, and where a line starts
Flat between dots means it did not drift, it held and then jumped, and a line starts when dibs first saw that lecture rather than reaching back before it existed. A lecture that has never moved draws a flat line across the whole window, and one with two or three readings draws a line joining them, which is too few to read a trend from.
Lec 1 · Colwell, C.S., Nwaobi-Petersen, S, Paul, K.N., Poe, G.R., and Ricketts, E. · 70 of 70 · 2 over enrolled
Nothing read since 16 Oct, 12 hours ago. Over about 2 months before that, unchanged.
Both readings say 70 of 70.
How readings and alerts work
Dated seat counts can be available even when hourly check history is missing. Gaps do not show whether seats changed between observations.
Seat counts show the last successful read, not live availability. Refreshes can be delayed by request limits or upstream interruptions. Watched sections receive priority, but an hourly update for every section is not guaranteed.
The registrar can change a seat count between our checks. Alerts depend on dibs detecting an opening and completing delivery; a quiet watch does not prove that no seat opened. Check the registrar before enrolling.