diff --git a/analyse.py b/analyse.py
index aea34ff..1a09b88 100755
--- a/analyse.py
+++ b/analyse.py
@@ -1,7 +1,7 @@
 #!/usr/bin/env python3.6
 from kython import *
 
-from backup_config import SLEEPS_FILE
+from backup_config import SLEEPS_FILE, GRAPHS_DIR
 
 from datetime import datetime
 from datetime import date
@@ -33,6 +33,9 @@ class SleepEntry:
     def completed(self) -> datetime:
         return datetime.fromtimestamp(self.js['time_completed'])
 
+    def graph(self) -> str:
+        return os.path.join(GRAPHS_DIR, self.xid() + ".png")
+
     def __str__(self) -> str:
         return f"{self.date_()} {self.title()}"
 
@@ -45,4 +48,33 @@ def load_sleeps() -> List[SleepEntry]:
         return [SleepEntry(js) for js in sleeps]
 
 sleeps = load_sleeps()
-pprint(sleeps[:2])
+# TODO use map?
+sleep = sleeps[0]
+# pprint(sleeps[:2])
+
+
+span = sleep.completed() - sleep.created()
+print(f"span: {span}")
+import numpy as np # type: ignore
+import matplotlib.pyplot as plt # type: ignore
+# pip install imageio
+from imageio import imread # type: ignore
+
+img = imread(sleep.graph())
+# all of them are 300x300 images apparently
+(a, b, _) = img.shape
+# print(img.shape)
+# print(img.size)
+print(a)
+print(b)
+
+np.random.seed(0)
+x = np.random.uniform(0.0, a, 100)
+y = np.random.uniform(0.0, b, 100)
+plt.scatter(x,y,zorder=1)
+plt.imshow(img,zorder=0)
+plt.title(str(sleep))
+plt.text(0, 0, str(sleep.created().time()))
+plt.text(300, 0, str(sleep.completed().time()))
+plt.show()
+