Table 2.
Nightly Sleep Percentages on Space Shuttle and ISS Missions
| SL-90 (Space Shuttle/ISS) | ||||
|---|---|---|---|---|
| Number of Hours |
Time in Bed N=1059/260 n(%)/n(%) |
Sleep Episode Time (Actigraphy) N=1047/257 n(%)/n(%) |
Total Sleep Time (Subjective Diary) N=1024/242 n(%)/n(%) |
Total Sleep Time (Actigraphy) N=1047/257 n(%)/n(%) |
| < 4 | 1(0·1)/1(0·4) | 2(0·2)/2(0·8) | 1(0·1)/2(0·8) | 23(2·2)/10(3·9) |
| ≥ 4 and < 5 | 10(0·9)/7(2·7) | 36(3·4)/13(5·1) | 22(2·2)/11(4·6) | 90(8·6)/28(10·9) |
| ≥ 5 and < 6 | 79(7·5)/35(13·5) | 114(10·9)/30(11·7) | 135(13·2)/39(16·1) | 294(28·1)/40(15·6) |
| ≥ 6 and < 7 | 243(23·0)/51(19·6) | 278(26·6)/60(23·4) | 335(32·7)/78(32·2) | 392(37·4)/94(36·6) |
| ≥ 7 and < 8 | 415(39·2)/89(34·2) | 371(35·4)/76(29·6) | 333(32·5)/53(21·9) | 177(16·9)/58(22·6) |
| ≥ 8 | 311(29·4)/77(29·6) | 246(23·5)/76(29·6) | 198(19·3)/59(24·4) | 71(6·8)/27(10·5) |
| L-11 (Space Shuttle/ISS) | ||||
|---|---|---|---|---|
| Number of Hours |
Time in Bed N=873/196 n(%)/n(%) |
Sleep Episode Time (Actigraphy) N=862/214 n(%)/n(%) |
Total Sleep Time (Subjective Diary) N=830/190 n(%)/n(%) |
Total Sleep Time (Actigraphy) N=863/214 n(%)/n(%) |
| < 4 | 0(0)/4(2·0) | 3(0·4)/7(3·3) | 4(0·5)/6(3.2) | 16(1·9)/18(8·4) |
| ≥ 4 and < 5 | 7(0·8)/5(2·6) | 24(2·8)/19(8·9) | 14(1·7)/9(4·7) | 5(12·9)/37(17·3) |
| ≥ 5 and < 6 | 45(5·2)/22(11·2) | 118(13·7)/28(13·1) | 93(11·2)/37(19·5) | 291(33·7)/48(22·4) |
| ≥ 6 and < 7 | 211(24·2)/43(21·9) | 280(32·5)/56(26·2) | 310(37·4)/64(33·7) | 306(35·5)/68(31·8) |
| ≥ 7 and < 8 | 388(44·4)/73(37·2) | 298(34·6)/66(30·8) | 329(39·6)/51(26·8) | 110(12·8)/34(15·9) |
| ≥ 8 | 222(25·4)/49(25·0) | 139(16·1)/38(17·8) | 80(9·6)/23(12·1) | 29(3·4)/9(4·2) |
| Inflight (Space Shuttle/ISS) | ||||
|---|---|---|---|---|
| Number of Hours |
Time in Bed N=922/996 n(%)/n(%) |
Sleep Episode Time (Actigraphy) N=1020/2948 n(%)/n(%) |
Total Sleep Time (Subjective Diary) N=925/987 n(%)/n(%) |
Total Sleep Time (Actigraphy) N=1020/2951 n(%)/n(%) |
| < 4 | 2(0·2)/16(1·6) | 12(1·2)/89(3·0) | 11(1·2)/31(3·12) | 38(3·7)/142(4·8) |
| ≥ 4 and < 5 | 6(0·7)/30(3·0) | 47(4·6)/161(5·5) | 54(5·8)/44(4·5) | 110(10·8)/376(12·7) |
| ≥ 5 and < 6 | 28(3·0)/110(11·0) | 120(11·8)/508(17·2) | 145(15·7)/166(16·8) | 332(32·6)/776(26·3) |
| ≥ 6 and < 7 | 156(16·9)/282(28·3) | 366(35·9)/818(27·8) | 414(44·8)/317(32·1) | 422(41·4)/942(31·9) |
| ≥ 7 and < 8 | 464(50·3)/282(28·3) | 443(43·4)/755(25·6) | 277(30·0)/266(27·0) | 115(11·3)/487(16·5) |
| ≥ 8 | 266(28·9)/276(27·7) | 32(3·1)/617(20·9) | 24(2·6)/163(16·5) | 3(0·3)/228(7·7) |
| R+7 (Space Shuttle/ISS) | ||||
|---|---|---|---|---|
| Number of Hours |
Time in Bed N=503/135 n(%)/n(%) |
Sleep Episode Time (Actigraphy) N=511/132 n(%)/n(%) |
Total Sleep Time (Subjective Diary) N=488/132 n(%)/n(%) |
Total Sleep Time (Actigraphy) N=511/121 n(%)/n(%) |
| < 4 | 3(0·6)/1(0·7) | 4(0·8)/2(1·5) | 3(0·6)/2(1·7) | 11(2·2)/3(2·3) |
| ≥ 4 and < 5 | 4(0·8)/1(0·7) | 7(1·4)/1(0·8) | 7(1·4)/3(2·5) | 34(6·7)/13(9·9) |
| ≥ 5 and < 6 | 19(3·8)/7(5·2) | 31(6·1)/9(6·8) | 39(8·0)/14(11·6) | 108(21·1)/17(12·9) |
| ≥ 6 and < 7 | 66(13·1)/17(12·6) | 92(18·0)/21(15·9) | 121(24·8)/23(19·0) | 145(28·4)/33(25·0) |
| ≥ 7 and < 8 | 137(27·2)/27(20·0) | 141(27·6)/26(19·7) | 164(33·6)/32(26·5) | 137(26·8)/26(19·7) |
| ≥ 8 | 274(54·5)/82(60·7) | 236(46·2)/73(55·3) | 154(31·6)/47(38·8) | 76(14·9)/40(30·3) |
| Night before EVA (Shuttle only) | ||||
|---|---|---|---|---|
| Number of Hours |
Time in Bed N=72 n(%) |
Sleep Episode Time (Actigraphy) N=80 n(%) |
Total Sleep Time (Subjective Diary) N=69 n(%) |
Total Sleep Time (Actigraphy) N=80 n(%) |
| < 4 | 0(0) | 0(0) | 0(0) | 1(1·3) |
| ≥ 4 and < 5 | 0(0) | 3(3·8) | 6(8·7) | 11(13·8) |
| ≥ 5 and < 6 | 1(1·4) | 11(13·8) | 13(18·8) | 29(36·3) |
| ≥ 6 and < 7 | 17(23·6) | 43(53·8) | 28(40·6) | 28(35·0) |
| ≥ 7 and < 8 | 34(47·2) | 20(25·0) | 19(27·5) | 10(12·5) |
| ≥ 8 | 20(27·8) | 3(3·8) | 3(4·3) | 1(1·3) |