diff --git a/jawbone_provider/__init__.py b/jawbone_provider/__init__.py
index 6be3997..67cff7b 100755
--- a/jawbone_provider/__init__.py
+++ b/jawbone_provider/__init__.py
@@ -1,20 +1,27 @@
-#!/usr/bin/env python3.6
-from kython import *
+#!/usr/bin/env python3
+from typing import Dict, Any, List
+import json
+from datetime import datetime, date, time
+from pathlib import Path
 
-from backup_config import SLEEPS_FILE, GRAPHS_DIR, PHASES_FILE
+BDIR = Path('/L/backups/jawbone')
+PHASES_FILE = BDIR / 'phases.json'
+SLEEPS_FILE = BDIR / 'sleeps.json'
+GRAPHS_DIR = BDIR / 'graphs'
 
-from datetime import datetime, date, time 
-fromtimestamp = datetime.fromtimestamp
 
-import os.path
+fromtimestamp = datetime.fromtimestamp # TODO careful
 
 XID = str # TODO how to shared with backup thing?
+
+
 Phases = Dict[XID, Any]
 
-phases: Phases
-with open(PHASES_FILE, 'r') as fo:
-    phases = json_load(fo)
 
+phases: Phases = json.loads(PHASES_FILE.read_text())
+
+# TODO namedtuple, cproperty?
+# TODO cache?
 class SleepEntry:
     def __init__(self, js) -> None:
         self.js = js
@@ -51,8 +58,8 @@ class SleepEntry:
         return fromtimestamp(self._details()['asleep_time'])
 
     @property
-    def graph(self) -> str:
-        return os.path.join(GRAPHS_DIR, self.xid + ".png")
+    def graph(self) -> Path:
+        return GRAPHS_DIR / (self.xid + ".png")
 
     @property
     def phases(self) -> List[datetime]:
@@ -65,15 +72,17 @@ class SleepEntry:
         return str(self)
 
 def load_sleeps() -> List[SleepEntry]:
-    with open(SLEEPS_FILE, 'r') as fo:
-        sleeps = json_load(fo)
-        return [SleepEntry(js) for js in sleeps]
+    sleeps = json.loads(SLEEPS_FILE.read_text())
+    return [SleepEntry(js) for js in sleeps]
+
+
 import numpy as np # type: ignore
 import matplotlib.pyplot as plt # type: ignore
 from matplotlib.figure import Figure # type: ignore
 from matplotlib.axes import Axes # type: ignore
+
 # pip install imageio
-from imageio import imread # type: ignore
+# from imageio import imread # type: ignore
 from scipy.misc import imresize # type: ignore
 
 
@@ -152,21 +161,22 @@ def plot_one(sleep: SleepEntry, fig: Figure, axes: Axes, xlims=None, showtext=Tr
         axes.text(xlims[1] - timedelta(hours=1.5), 20, str(sleep),)
     # plt.text(sleep.asleep(), 0, hhmm(sleep.asleep()))
 
-sleeps = load_sleeps()
-
-sleeps = [s for s in sleeps if os.path.lexists(s.graph)]
-sleeps_by_date = {s.date_: s for s in sleeps}
+from kython import make_dict
+def sleeps_by_date() -> Dict[date, SleepEntry]:
+    sleeps = load_sleeps()
+    sleeps = [s for s in sleeps if s.graph.exists()] # TODO careful..
+    return make_dict(sleeps, key=SleepEntry.date_)
 
 # sleeps_count = 35 # len(sleeps) # apparently MPL fails at 298 with outofmemory or something
 # start = 40
 # 65 is arount 1 july
 # sleeps = sleeps[start: start + sleeps_count]
 # sleeps = sleeps[:sleeps_count]
-import melatonin
-dt = melatonin.get_data()
 # dt = {k: v for k, v in dt.items() if v is not None}
 
-sleeps = list(sleeps_by_date.values()) # [sleeps_by_date[d] for d in dt if d in sleeps_by_date]
+# TODO ??
+# import melatonin
+# dt = melatonin.get_data()
 
 def predicate(sleep: SleepEntry):
     """
@@ -178,38 +188,40 @@ def predicate(sleep: SleepEntry):
         return True
     return False
 
-sleeps = lfilter(predicate, sleeps)
-sleeps_count = len(sleeps)
-print(sleeps_count)
+
+def plot():
+    # TODO ??
+    sleeps = lfilter(predicate, sleeps)
+    sleeps_count = len(sleeps)
+    print(sleeps_count)
+
+    fig: Figure = plt.figure(figsize=(15, sleeps_count * 1))
+
+    axarr = fig.subplots(nrows=len(sleeps))
+    for i, (sleep, axes) in enumerate(zip(sleeps, axarr)):
+        plot_one(sleep, fig, axes, showtext=True)
+        used = dt.get(sleep.date_, None)
+        sused: str
+        color: str
+        # used = True if used is None else False # TODO?
+        if used is True:
+            sused = "YES"
+            color = 'green'
+        elif used is False:
+            sused = "NO"
+            color = 'red'
+        else:
+            sused = "??"
+            color = 'white'
+        axes.text(axes.get_xlim()[0], 20, sused)
+        axes.patch.set_alpha(0.5)
+        axes.set_facecolor(color)
 
 
-fig: Figure = plt.figure(figsize=(15, sleeps_count * 1))
-
-axarr = fig.subplots(nrows=len(sleeps))
-for i, (sleep, axes) in enumerate(zip(sleeps, axarr)):
-    plot_one(sleep, fig, axes, showtext=True)
-    used = dt.get(sleep.date_, None)
-    sused: str
-    color: str
-    # used = True if used is None else False # TODO?
-    if used is True:
-        sused = "YES"
-        color = 'green'
-    elif used is False:
-        sused = "NO"
-        color = 'red'
-    else:
-        sused = "??"
-        color = 'white'
-    axes.text(axes.get_xlim()[0], 20, sused)
-    axes.patch.set_alpha(0.5)
-    axes.set_facecolor(color)
-
-
-plt.tight_layout()
-plt.subplots_adjust(hspace=0.0)
-# er... this saves with a different aspect ratio for some reason.
-# tap 'ctrl-s' on mpl plot window to save..
-# plt.savefig('res.png', asp)
-plt.show()
+    plt.tight_layout()
+    plt.subplots_adjust(hspace=0.0)
+    # er... this saves with a different aspect ratio for some reason.
+    # tap 'ctrl-s' on mpl plot window to save..
+    # plt.savefig('res.png', asp)
+    plt.show()