1. Deep sleeps → COMAS
6. High-speed Amtrak train → ACELA
11. Word with punching or sleeping → BAG
14. One of a battery's poles → ANODE
15. Older but ___ → WISER
16. Under the weather → ILL
17. Saxophone, trumpet, piano and bass, perhaps → JAZZQUARTET
19. Day-___ paint → GLO
20. "Garfield" dog → ODIE
21. "It's freezing!" → BRR
22. Typical "Survivor" locales → ISLES
24. Rapper ___ Uzi Vert → LIL
25. Yoda and Obi-Wan Kenobi, for two → JEDIMASTERS
28. Fish that may have an electric charge → EEL
29. Stammering sounds → ERS
30. Indignation → OUTRAGE
31. What each U.S. senator represents → STATE
33. Raggedy ___ → ANN
34. Breyers competitor → EDYS
35. Some exams allow them → OPENNOTES
39. Cops, slangily → POPO
42. Rode the bench → SAT
43. Yoga pose → ASANA
47. Enjoying great success → ONATEAR
49. What electric cars don't use → GAS
51. Like a 49-Across gauge that's near "Empty" → LOW
52. Overly fussy → PERSNICKETY
54. Bit of forensic evidence → DNA
55. Pink ___ (rock band) → FLOYD
56. Singer DiFranco → ANI
57. Bill → BEAK
58. Mideast export → OIL
59. Cheat ... or a punny hint to the four sets of circled letters → SHORTCHANGE
63. French "a" → UNE
64. Hearing-related → AURAL
65. Playwright Chekhov → ANTON
66. Kind of lamp that's energy-efficient → LED
67. Easily irritated → TESTY
68. Romeo and Juliet, agewise → TEENS